TBM Face Pressure Calculation

DOWNTOWN LINE 2 – CONTRACT C918

Revision B

Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation

Table of Contents 0 

REVISION RECORD........................................................................................................................... 2 

1 

INTRODUCTION ................................................................................................................................. 3 

2 

ALIGNMENT AND GROUND CONDITIONS ..................................................................................... 4 

2.1 

Alignment ............................................................................................................................................ 4 

2.2 

Ground Conditions .............................................................................................................................. 4 

3 

CALCULATIONS ................................................................................................................................ 5 

4 

CONCLUSIONS & RECOMMENDATIONS ....................................................................................... 6 

4.1 

General ................................................................................................................................................ 6 

4.2 

TBM Operation .................................................................................................................................... 6 

4.3 

Recommendations .............................................................................................................................. 6 

5 

REFERENCES .................................................................................................................................... 8 

APPENDIX: Appendix 1

Ground Information

Appendix 2

Design Parameter and Input Data

Appendix 3

Recommended Face Pressure Values

Appendix 4

Cutter Head Intervention

Job No. S4922

Geoconsult Asia Singapore

01/08/2012

Page 1

DOWNTOWN LINE 2 – CONTRACT C918

Revision B

Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation

0

REVISION RECORD Revision

Description of Amendments

Date

-

First Issue

20/06/2011

A

Final Submission

13/09/2011

B

Final Submission – Revised According to LTA’s Comments

01/08/2012

File: W:\wo0_job\49\22-C918-DD Alpine\TECH-DOC\Reports\Face Pressure\TKK to BTN\Rev. B\DOC-918-TUNDCS-9101_B.doc

Job No. S4922

Geoconsult Asia Singapore

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DOWNTOWN LINE 2 – CONTRACT C918

Revision B

Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation

1

INTRODUCTION Contract 918 consists of design and construction of station at Tan Kah Kee, the twin bored tunnels from the cross over box northwest of Tan Kah Kee Station (TKK) to the station at Sixth Avenue (SAV) within C917, and another twin bored tunnels between the Tan Kah Kee station (TKK) and the station at Botanic Garden (BTN) to be constructed under the C919. The Tunnel works include twin bored tunnel with inner diameter of 5.8m and outer diameter 6.35m as well as two mined cross passages. The total length of the twin bored tunnel is about 1.483 kilometres. The length of twin bored tunnel from Cut Cover Tunnel to Sixth Avenues Station is 0.558 kilometres and the length of twin bored tunnel from Tan Kah Kee Station to Botanic Garden Station (BTN) is 0.925 kilometres. This report provides estimate of required face pressures to be applied and controlled during driving from TKK to BTN station only. The estimated TBM face pressure for bored tunnels between CCT and SAV station is covered by a separate report. The twin bored tunnel will be constructed by slurry tunnel boring machines (slurry TBMs). The slurry TBM is designed to allow excavation in the varying soft ground conditions. Pre-cast concrete segmental lining, designed to provide the final permanent support, will be installed at the tail section of the TBM as it advances though the ground. The report shall be read in conjunction with drawing and geotechnical data presented in Appendix 1 and Appendix 2. The overall site plan of Contract C918 is presented in Figure 1-1 below.

Figure 1-1: Site Plan of Contract C918

Job No. S4922

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DOWNTOWN LINE 2 – CONTRACT C918

Revision B

Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation

2

ALIGNMENT AND GROUND CONDITIONS

2.1

ALIGNMENT As stated above, contract C918 bored tunnel alignment features twin bored tunnels. At Launching area: − Expo Bound Track tunnel (Left tunnel from TKK to BTN) − Bukit Panjang Bound Track tunnel (Right tunnel from TKK to BTN) At Receiving area: − Expo Bound Track tunnel (Left tunnel from TKK to BTN) − Bukit Panjang Bound Track tunnel (Right tunnel from TKK to BTN) As mentioned in Section 1 above, the alignment of DTL 2 for C918 commences from the launching area which is located at the TKK station. After the launch, the TBMs will run more or less at the same level throughout the drive. The length of the bored tunnels is about 0.925 kilometers for each drive. Both tunnels will be driven along decreasing chainages.

2.2

GROUND CONDITIONS The ground conditions are interpreted based on GIBR attached in LTA consolidated working document documents Ref [1]. The project site is located primarily in Fill underlying by Kallang Formation and the bottom layers are comprised of Bukit Timah Granite. The subsurface layering can be classified into the following layers: −

Fill

−

Estuarine Clay (E)

−

Fluvial Clay (F2)

−

Fluvial Sand (F1)

−

Residual soil of Grade VI (GVI) and Grade V (GV)

−

Various grades of Rock, i.e. Grade IV (GIV), Grade III (GIII), Grade II (GII) and Grade I (GI)

For easy reference, the soil profile along the tunnel alignment is presented in Appendix 1.

Job No. S4922

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DOWNTOWN LINE 2 – CONTRACT C918

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Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation

3

CALCULATIONS The calculation approach investigates the stability of tunnel face by considering limit equilibrium of a sliding wedge at the face loaded by a prismatic body. The imposed loads comprise of surface surcharge of 20 kPa and gravity loading of soil above the sliding wedge. Ground water table at 1m below the ground surface is considered in calculations. Both drained and undrained behaviours of relevant soil materials are examined. Generally, recommended face pressures are derived from the more conservative drained case. A total of 38 sections for each TBM drive have been calculated. Selection of sections for calculations is based on variations of overburden, and geology at the tunnel face. The distance between the analysis sections is generally about 25m. The calculation approach is based on Anagnostou and Kovari, Ref.[7]. This approach has previously been applied successfully to the TBM tunnel drives for other projects in Singapore including, the North East Line, the Deep Tunnel Sewerage System (DTSS), the Circle Line Stages 2, 3, 4 & 5 and the Downtown Line 1. The following design considerations are mentioned in particular: 1. The ground conditions at tunnel level and above are taken from the geotechnical interpretive report and the geotechnical soil profile which is presented in Appendix 1. 2. TBM face pressures are derived by calculations based on the approach presented in Ref.[7], considering the local ground conditions as well as groundwater seepage forces at the face. 3. Seepage pressure and related temporary depressurisation at the excavation face were considered in the analyses using drained soil parameters. Since the TBM will be advancing at an average rate of about 10m per day, this is considered conservative. The input parameters used in calculation are summarized in Appendix 2 and the results of calculations are summarised in Appendix 3.

Job No. S4922

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DOWNTOWN LINE 2 – CONTRACT C918

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Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation

4

CONCLUSIONS & RECOMMENDATIONS

4.1

GENERAL Based on existing ground conditions at tunnel level, the required face pressures are calculated and presented in Appendix 3.

4.2

TBM OPERATION The twin bored tunnels will be driven using two slurry TBM for each drive. The TBM is expected to be operated with the pressure chamber fully filled and pressurized, such that the recommended face pressure range as provided in Appendix 3 is maintained at all times. The tables in Appendix 3 provide the following information: − Recommended face pressure range at tunnel axis level − Recommended tail void grouting pressure range − Recommended compressed air pressure during cutterhead interventions − Hydrostatic groundwater pressure at tunnel axis level

4.3

RECOMMENDATIONS The recommended face pressure ranges are proposed in Appendix 3. The proposed values are based on the understanding that during TBM driving, the following strategy will be adopted in principle: − In general, the applied face pressure shall be within the recommended face pressure range at all times − Shop Houses: From the findings of the CIAR, Ref. [9], the tunnel excavation needs to limit the volume loss to 1.0% in the zone of the Shop Houses. The conclusion from that assessment is that the volume loss of 1.0% needs to be applied for Bukit Panjang bound tunnel only between chainage 46+020 and 45+950. According to Report Ref. [8], Figure 4-4 the recommended minimum face pressure is 220 kPa as indicated on the graph in Appendix 3. − DTSS: The TBMs will be operated at target face pressures, which are typically in the range of the local hydrostatic groundwater pressure. In this kind of operation scenario, drastic pressure gradients between the TBM’s excavation chamber and the outside water pressure are avoided.

Job No. S4922

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DOWNTOWN LINE 2 – CONTRACT C918

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Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation

− Cluny Court: From the findings of the CIAR, Ref. [9], the tunnel excavation needs to limit the volume loss to 0.5% in the zone of Cluny Court building. The conclusion from that assessment is that the volume loss of 0.5% needs to be applied for both tunnel drives of Bukit Panjang and Expo bounds between chainage 46+020 and 45+950. According to Report Ref. [8], Figure 4-1, the recommended minimum face pressure is 300 kPa as indicated on the graphs in Appendix 3. − CCL Tunnels: Ref. [8] includes the volume loss assessment for the above CCL tunnels (refer to Figure 4-2). Within this zone, TBM face pressures in the range of 300kPa is required in order to maintain the volume loss of 0.5% or below, which is the maximum volume loss for this area in accordance with the project specifications, Ref. [3]. During the approach of the C918 TBMs towards the CCL crossing area, the volume loss shall be verified in monitoring sections. The recommended minimum face pressure at the monitoring sections are indicated on the graphs in Appendix 3. − Settlements and muck volume balance shall be continuously determined to provide the main criteria to judge the adequacy of applied face pressures. − For cutterhead intervention (refer to Appendix 4), it is recommended to initially apply at least the stated air pressure. However, after visual inspection and verification, the air pressure may be reduced in stages. If no are adverse soil behavior is visible at the face and the stability of excavation face is ensured, the intervention may be even be carried out in atmospheric conditions (“free air”). − The actual face pressures applied during driving and air pressures during cutterhead interventions shall be reviewed by the TBM operation team, QP(D), QP(S) and LTA project team on a regular basis. If necessary, the recommended pressure values presented in this report shall be updated.

Job No. S4922

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01/08/2012

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DOWNTOWN LINE 2 – CONTRACT C918

Revision B

Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation

5

REFERENCES For the preparation of this document the following data sources were used: [1]

LTA; Working documents; Geotechnical Interpretative Baseline Report (GIBR) for C918

[2]

Land Transport Authority, Consolidated Working Documents for Contract C918, General Specification.

[3]

Land Transport Authority, Consolidated Working Documents for Contract C918, Particular Specification.

[4]

Land Transport Authority, Civil Design Criteria.

[5]

Land Transport Authority, Consolidated Working documents for Contract C918, Factual Geotechnical Report.

[6]

SIL, Additional Soil Investigation Works for C918 Tunnel Section, Borelogs

[7]

G. Anagostou, K. Kovari: “Face Stability in Slurry and EPB Shield Tunnelling”; Tunnels & Tunnelling; December 1996

[8]

Contractor’s Design Consultant, Volume Loss Assessment, Document No.: DOC/918/TUN/DCS/9040

[9]

Contractor’s Design Consultant, Impact Assessment for Bored Tunnel, Document No.: DOC/918/TUN/DCS/9060

[10] Contractor’s Design Consultant, Interfacing of C918 Bored Tunnels with existing CCL MRT Tunnels, Document No.: DOC/918/TUN/DCS/9062

Job No. S4922

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DOWNTOWN LINE 2 – CONTRACT C918

Revision B

Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation

Appendix

Appendix 1: Ground Information

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DOWNTOWN LINE 2 – CONTRACT C918

Revision B

Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation

Appendix

Appendix 2: Design Parameter and Input Data

Job No. S4922

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Page 1

Geotechnical Design Parameters for Bukit Panjang Bound DTL MRT Project Bukit Panjang Bound - C918 1

GW cond

Chainage

2

3

4

(mDMD) (mDMD) Geotechnical Ground Level Top of Rail Unit at Tunnel Axis

10

11

12

13

14

15

Soil Layer Type Layer 1

Layer 2

Layer 3

Layer 4

Layer 5

Layer 6

16

17

(m) Z1

(m) Z2

18 19 Soil Layers Depth (m) (m) Z3 Z4

20

21

22

23

(m) Z5

(m) Z6

kN/m3 γ1

kN/m3 γ2

24 25 Bulk Weight kN/m3 kN/m3 γ3 γ4

26

27

kN/m3 γ5

kN/m3 γ6

28

29

kN/m2 Additional Effective Lateral surcharge Earth Pressure Coefficient

Bukit Panjang Bound 1 2 3 4 5 6 7 8 8a 8b 9 10 11 12 13 14 15 16 16a 16b 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

46+727.180 46+700.000 46+675.000 46+650.000 46+625.000 46+600.000 46+575.000 46+550.000 46+541.000 46+535.000 46+525.000 46+500.000 46+475.000 46+450.000 46+425.000 46+400.000 46+375.000 46+350.000 46+341.200 46+329.400 46+325.000 46+300.000 46+275.000 46+250.000 46+225.000 46+200.000 46+175.000 46+150.000 46+125.000 46+100.000 46+075.000 46+050.000 46+025.000 46+000.000 45+975.000 45+950.000 45+925.000 45+900.000 45+875.000 45+850.000 45+825.000 45+809.880

GIII GIII GVI N-3 N-3 N-3 N-3 GVI GVI GVI GVI GVI GVI GV50 GV50 GV50 GV70 GV90 GV120 GV120 GV120 GV120 GV120 GIII GIII GIII GV150 GV150 GV120 GIV GIII GIII GV70 GV120 GV120 N-1 GV150 GV150 GV70 GV70 GV70 GII

104.000 104.000 104.000 104.000 104.000 104.000 104.000 104.000 104.000 101.400 104.000 104.000 104.000 104.000 104.000 104.000 104.000 104.000 104.000 101.000 104.000 104.000 104.000 104.000 104.500 105.000 104.500 104.000 104.000 104.000 103.750 103.500 103.650 101.300 103.500 103.200 105.100 106.000 106.300 105.600 106.250 106.500

84.700 83.900 83.100 82.400 81.600 80.900 80.100 79.500 79.500 79.500 79.500 77.900 77.100 76.400 75.700 74.800 74.100 73.400 72.600 72.600 72.600 71.900 71.100 70.400 70.300 68.800 68.300 68.100 68.100 68.140 69.950 69.800 69.750 70.000 70.500 71.000 71.500 72.200 72.650 73.300 73.800 74.000

FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL

E E E E E E E E E E E E E E E E E E E E E E E F1 F1 F1 E E E E GVI E E E E E E E E E E E

F2 F2 F1 F1 F1 F1 F2 F1 F1 F1 F1 F1 F1 F2 F2 F2 F1 F2 F2 F2 F2 F2 F2 GVI GVI GVI F1 F2 F2 F2 GV70 GVI F2 F2 F2 F1 F1 F1 F2 F2 F1 F2

GVI GVI GVI GVI F1 F1 F1 GVI GVI GVI GVI GVI E GVI GVI GVI GVI GVI GVI GVI GVI GVI GVI GV70 GV70 GV70 GVI GVI GVI GVI GIV GV120 GVI GVI GVI GVI GVI GVI GVI GVI GVI GVI

GIII GVI GVI GVI GVI GVI GVI GVI GVI GVI GVI GVI GVI GV50 GV50 GV50 GV50 GV90 GV120 GV120 GV120 GV120 GV120 GVI GVI GIII GV150 GV150 GV70 GV120 GIII GIII GV70 GV120 GV120 GV150 GV70 GV70 GV70 GV70 GV GII

GIII GIII GVI N-3 N-3 N-3 N-3 GVI GVI GVI GVI GVI GVI GV50 GV50 GV50 GV70 GV90 GV120 GV120 GV120 GV120 GV120 GIII GIII GIII GV150 GV150 GV120 GIV GIII GIII GV70 GV120 GV120 N-1 GV150 GV150 GV70 GV70 GV70 GII

2.40 2.00 3.31 3.70 2.30 3.00 2.80 2.51 3.10 0.50 3.10 3.80 3.80 3.00 2.70 3.11 4.00 4.00 4.30 1.30 4.30 3.50 2.70 6.30 6.20 5.41 3.00 2.00 2.51 2.21 7.40 3.00 4.00 1.70 3.90 4.00 5.30 6.90 7.00 6.50 5.55 5.40

3.80 4.00 4.20 3.80 4.11 4.10 3.30 4.50 3.60 3.60 3.60 3.10 3.00 4.10 4.90 4.20 5.00 6.00 3.40 3.40 3.40 2.70 1.21 3.00 3.00 6.00 3.00 4.00 4.00 6.50 7.40 6.51 4.50 4.10 4.90 5.00 4.60 3.30 5.60 5.20 5.80 5.70

1.80 1.40 3.30 3.70 3.35 4.00 2.11 7.00 6.50 6.50 6.50 7.00 6.81 6.00 4.70 6.20 4.80 2.20 4.40 4.40 4.40 3.40 4.00 6.00 6.10 7.40 6.20 4.81 4.00 13.00 9.00 6.30 3.40 6.50 6.00 6.00 6.50 9.80 7.35 6.40 4.80 4.30

3.90 4.00 2.70 3.70 3.35 4.00 8.00 2.90 3.30 3.30 3.30 3.80 1.70 7.00 7.70 8.00 9.00 9.50 7.61 7.61 7.61 9.10 9.80 9.20 9.10 8.50 11.60 5.00 7.40 4.95 3.00 9.70 10.51 4.80 4.00 3.00 3.90 2.90 6.30 7.10 6.40 6.00

2.70 4.00 2.70 2.00 4.60 3.30 3.00 2.90 3.30 3.31 3.30 3.70 6.90 2.80 3.60 3.00 2.41 4.20 7.00 7.00 7.00 8.70 10.50 4.40 5.11 4.20 7.71 15.40 13.30 4.51 2.30 3.50 6.80 9.50 9.50 9.51 8.60 6.20 2.70 2.40 5.20 6.40

3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17

18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7

15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 19 19 19 15 15 15 15 18.5 15 15 15 15 15 15 15 15 15 15 15

18.5 18.5 19 19 19 19 18.5 19 19 19 19 19 19 18.5 18.5 18.5 19 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 19 18.5 18.5 18.5 19.5 18.5 18.5 18.5 18.5 19 19 19 18.5 18.5 19 18.5

18.5 18.5 18.5 18.5 19 19 19 18.5 18.5 18.5 18.5 18.5 15 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 19.5 19.5 19.5 18.5 18.5 18.5 18.5 23 19.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5

23 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 18.5 18.5 23 19.5 19.5 19.5 19.5 23 23 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 24

23 23 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 23 23 23 19.5 19.5 19.5 23 23 23 19.5 19.5 19.5 21.3 19.5 19.5 19.5 19.5 19.5 24

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0.30 0.30 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.30 0.30 0.30 0.50 0.50 0.50 0.30 0.30 0.30 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.30

Cutterhead Intervention CHI1 46+636.000 GV50 CHI2 46+430.000 GV70 CHI3 46+341.200 GV90 CHI4 46+280.000 GV90 CHI5 46+131.000 GV120 CHI6 46+020.000 GV120 CHI7 45+870.000 GV90

103.720 103.900 104.000 104.400 103.500 103.750 105.500

81.600 75.700 73.400 71.300 67.900 69.700 72.600

FILL FILL FILL FILL FILL FILL FILL

E E E E E E E

F1 F1 F2 F1 F2 F1 F2

F1 GVI GVI GVI GVI GVI GVI

GVI GV70 GV90 GV70 GV70 GV120 GV90

GV50 GV70 GV90 GV90 GV120 GV120 GV90

2.50 2.71 4.00 3.00 1.80 3.70 6.90

3.80 4.70 6.00 1.61 4.00 4.45 4.80

4.50 5.00 2.20 3.80 4.50 5.60 7.61

4.50 7.60 9.50 10.00 5.30 7.00 5.30

2.13 3.50 4.20 10.00 15.30 8.60 3.60

3.17 3.17 3.17 3.17 3.17 3.17 3.17

18.7 18.7 18.7 18.7 18.7 18.7 18.7

15 15 15 15 15 15 15

19 19 18.5 19 18.5 19 18.5

19 18.5 18.5 18.5 18.5 18.5 18.5

18.5 19.5 19.5 19.5 19.5 19.5 19.5

19.5 19.5 19.5 19.5 19.5 19.5 19.5

0 0 0 0 0 0 0

0.50 0.50 0.50 0.50 0.50 0.50 0.50

MasterGTInfo-C918_Bukit Panjang

MasterGTInfo-C918_Bukit Panjang Page 17

Geoconsult Asia Singapore

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Project - Contract C918 Bukit Panjang Bound(TKK To BTN) INPUT PARAMETERS - TUNNEL GEOMETRY AND GROUND PROPERTIES Tunnel Geometry D cor D rel

[m] [%]

6.60 60%

[m]

4.17

P Lscrew

[m]

0.89

[m]

na

[kPa]

20.00

Overall factor of safety

q FS tot

[-]

1.20

(applied to driving forces in force equilibrium)

Air pressure FOS

FS air

[-]

1.00

(normally use 1.0 - especially in shallow ground order to avoid air blow-out)

γ cu

[-]

1.00

(applied to strength parameter, cu)

γφ

[-]

1.00

(applied to strength parameter, phi)

Minimim tail void grout pressure

ptv

[kPa]

350

Minimum nominal face pressure

Flagfpmin

[-]

Y

fpmin

[%]

30%

pair-0

[kPa]

80

10

9

7

8

2

3

Fill F1 F2 E GVI GV L GV GIV GIII GII GV50 GV70 GV90 GV120 GV150 GVI50

c' [kPa] 0.00 0.00 0.00 0.00 3.00 4.00 4.00 50.00 300.00 500.00 4.00 4.00 4.00 4.00 4.00 3.00

f [deg] 30.00 29.00 24.00 22.00 30.00 31.00 31.00 40.00 45.00 50.00 31.00 31.00 31.00 31.00 31.00 30.00

g [kN/m3] 18.70 19.00 18.50 15.00 18.50 19.50 19.50 23.00 23.00 24.00 19.50 19.50 19.50 19.50 19.50 18.50

cu [kPa] 20.00 0.00 21.00 10.00 90.00 200.00 200.00 250.00 0.00 0.00 200.00 200.00 200.00 200.00 200.00 90.00

K0 [-] 0.50 0.50 0.75 0.75 0.50 0.50 0.50 0.30 0.30 0.30 0.50 0.50 0.50 0.50 0.50 0.50

E [MPa] 7.00 13.00 5.50 1.70 37.00 60.00 90.00 300.00 3000.00 6000.00 50.00 70.00 90.00 120.00 150.00 50.00

N-1 N-2 N-3 N-4 N-5

4.00 50.00 3.00 3.00 3.00

31.00 40.00 30.00 30.00 30.00

21.30 23.50 18.50 18.50 18.50

0.00 0.00 0.00 0.00 0.00

0.50 0.50 0.50 0.50 0.50

588.50 3369.20 43.40 37.00 37.00

S-1 S-2 S-3 S-4 S-5 S-6 S-7 S-8

4.00 4.00 300.00 4.00 3.00 3.00 3.00 3.00

31.00 31.00 45.00 31.00 30.00 30.00 30.00 30.00

21.30 23.50 21.30 19.00 18.50 18.50 18.50 18.50

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

0.50 0.50 0.30 0.50 0.50 0.50 0.50 0.50

1433.10 1024.60 1476.90 62.40 43.00 3923.10 47.60 37.00

TBM diameter Cutterhead opening ratio Relevant face diameter Length of TBM cutter head Length of screw conveyor Surcharge

Soil material, partial strength factor

Nominal intial compressed air pressure

Design Parameters x

Soil / Rock Type

C918-TBM-Face Press_B.Panjang Bound_RevC

(percent of area covered by cutting wheel)

(Yes or any other input is No) (percentage of full porewater pressure at tunnel level) (compressed air pressure to be applied initially for cutterhead intervention, applies only if free air intervention is possible)

Input

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Geotechnical Design Parameters for Expo Bound DTL MRT Project Expo Bound - C918 1

GW cond 1 2 3 4 5 6 7 8 9 9a 9b 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

Chainage

46+735.651 46+700.000 46+675.000 46+650.000 46+625.000 46+600.000 46+575.000 46+550.000 46+525.000 46+523.500 46+510.970 46+500.000 46+475.000 46+450.000 46+425.000 46+400.000 46+375.000 46+350.000 46+325.000 46+300.000 46+275.000 46+250.000 46+225.000 46+200.000 46+175.000 46+150.000 46+125.000 46+100.000 46+075.000 46+050.000 46+025.000 46+000.000 45+975.000 45+950.000 45+925.000 45+900.000 45+875.000 45+850.000 45+825.000 45+809.881

2

3

4

(mDMD) (mDMD) Geotechnical Ground Level Top of Rail Unit at Tunnel Axis

10

11

12

13

14

15

Soil Layer Type Layer 1

Layer 2

Layer 3

Layer 4

Layer 5

Layer 6

16

17

(m) Z1

(m) Z2

18 19 Soil Layers Depth (m) (m) Z3 Z4

20

21

22

23

(m) Z5

(m) Z6

kN/m3 γ1

kN/m3 γ2

24 25 Bulk Weight kN/m3 kN/m3 γ3 γ4

26

27

kN/m3 γ5

kN/m3 γ6

28

29

kN/m2 Additional Effective Lateral surcharge Earth Pressure Coefficient

GIII S-6 GIII S-5 GVI S-5 S-4 S-4 GVI GVI GVI GV70 GV70 GV90 GV90 GV90 GV90 GV90 GV50 GV50 GV90 GV120 GV150 S-3 GV120 S-2 GV120 GV120 GV120 GV120 GV120 GV120 S-1 S-1 GV90 GV90 GV90 GV50 GII GII

103.800 103.000 104.000 104.000 103.700 104.000 104.000 104.000 104.000 104.000 101.400 104.000 104.200 104.500 99.100 99.000 99.000 99.200 99.000 99.700 100.400 100.300 99.800 99.500 99.200 99.000 99.300 99.100 99.000 98.000 97.900 98.300 98.300 98.300 104.000 104.200 104.500 105.500 105.000 105.200

85.000 84.200 83.500 83.000 82.000 81.000 80.500 80.000 79.000 79.000 78.629 78.000 77.700 77.000 76.100 75.000 74.600 74.000 73.500 73.000 72.200 71.500 71.100 71.000 69.900 69.000 68.700 68.200 67.900 67.800 68.100 68.600 69.200 70.000 69.300 71.500 72.200 73.000 74.000 73.900

FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL FILL

E E E E E E E E F2 F2 F2 E E E E E E E E E E E GVI GVI GVI E E E E E E E E E E E E E E E

F2 E F1 F1 F1 F2 F1 F1 E E E F1 F2 F1 F2 F2 F2 F2 F2 F2 GVI F2 GVI GVI GVI GVI GVI GVI GVI F1 F2 F2 F1 F1 F1 F2 F2 F2 F2 F1

F1 F1 F1 GVI F2 F1 F1 GVI F1 F1 F1 GVI F1 GVI GVI GVI GVI GVI F1 F1 GVI GVI GV GVI GV70 GV120 GV70 GVI GV50 GVI GVI GVI GVI GVI GVI GVI GVI GVI GVI GVI

GVI S-6 GIII GVI GVI GVI GVI GVI GVI GVI GVI GVI GVI GV70 GV50 GV50 GV90 GV90 GVI GVI GV90 GV120 GV50 GV120 GV120 GV120 GV120 GV120 GV90 GV120 GV90 GV90 GV90 GV90 GV90 GV90 GV90 GV50 GII GII

GIII S-6 GIII S-5 GVI S-5 S-4 S-4 GVI GVI GVI GV70 GV70 GV90 GV90 GV90 GV90 GV90 GV50 GV50 GV90 GV120 GV150 S-3 GV120 S-2 GV120 GV120 GV120 GV120 GV120 GV120 S-1 S-1 GV90 GV90 GV90 GV50 GII GII

2.30 2.70 3.60 4.00 2.80 3.00 2.90 3.00 2.90 2.90 0.67 3.00 2.80 3.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.81 3.70 4.20 5.00 4.11 3.50

4.70 2.20 4.00 4.00 1.31 3.00 3.00 4.00 1.91 1.91 1.91 6.00 7.50 6.80 2.10 1.71 3.31 4.30 1.00 0.00 1.21 0.00 4.40 0.00 3.70 0.00 0.00 0.30 1.80 1.31 0.91 2.01 2.50 3.10 5.40 4.30 3.60 4.01 4.30 5.10

4.00 2.20 2.40 6.00 3.70 2.00 4.40 6.00 2.90 2.90 2.90 4.00 1.40 4.80 7.50 6.00 2.90 2.01 2.00 1.71 10.00 4.90 5.90 6.00 5.70 7.00 9.00 5.00 9.60 2.80 6.50 5.50 3.00 2.20 3.00 3.21 3.90 3.40 3.00 2.50

1.40 3.30 2.40 1.00 6.00 7.00 4.40 3.00 3.50 3.50 3.50 4.00 2.40 5.60 4.00 4.00 5.30 10.60 1.50 2.00 10.00 14.60 5.90 7.00 7.60 15.00 8.45 5.00 7.50 8.30 5.00 5.80 8.20 9.00 8.00 6.90 6.10 6.80 8.90 9.50

1.70 3.70 3.40 1.30 3.20 3.30 4.10 3.30 9.10 9.10 9.10 4.30 7.70 2.60 4.70 7.60 8.20 3.60 16.30 18.30 2.30 4.60 7.80 10.80 7.60 3.30 8.45 15.90 7.50 13.10 12.70 11.70 10.70 9.30 9.80 9.90 9.80 8.60 6.00 6.00

3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17

18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7

15 15 15 15 15 15 15 15 18.5 18.5 18.5 15 15 15 15 15 15 15 15 15 15 15 18.5 18.5 18.5 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15

18.5 15 19 19 19 18.5 19 19 15 15 15 19 18.5 19 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 19 18.5 18.5 19 19 19 18.5 18.5 18.5 18.5 19

19 19 19 18.5 18.5 19 19 18.5 19 19 19 18.5 19 18.5 18.5 18.5 18.5 18.5 19 19 18.5 18.5 19.5 18.5 19.5 19.5 19.5 18.5 19.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5

18.5 18.5 23 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 18.5 19.5 19.5 19.5 19.5 19.5 18.5 18.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 24 24

23 18.5 23 18.5 18.5 18.5 19 19 18.5 18.5 18.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5 21.3 19.5 23.5 19.5 19.5 19.5 19.5 19.5 19.5 21.3 21.3 19.5 19.5 19.5 19.5 24 24

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0.30 0.50 0.30 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.30 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.30 0.30

Cutterhead Intervention CHI1 46+635.000 GVI CHI2 46+380.000 GV90 CHI3 46+276.000 GV120 CHI4 46+132.000 GV120 CHI5 46+035.000 GV120 CHI6 46+005.000 GV120 CHI7 45+980.000 S-1 CHI8 45+870.000 GV90

104.000 104.000 105.400 104.300 102.900 103.300 103.300 104.500

82.300 74.600 72.200 68.700 68.100 68.600 69.200 72.200

FILL FILL FILL FILL FILL FILL FILL FILL

E E E E E E E E

F1 F2 GVI GVI F2 F2 F1 F2

F2 GVI GVI GV70 GVI GVI GVI GVI

GVI GV90 GV120 GV120 GV90 GV90 GV90 GV90

GVI GV90 GV120 GV120 GV120 GV120 S-1 GV90

3.20 3.21 3.00 3.00 2.00 2.51 2.50 4.20

1.90 5.10 3.21 1.70 3.91 4.50 5.00 3.60

3.11 2.90 10.00 9.30 6.50 5.50 3.00 3.90

5.60 5.30 10.00 8.45 5.00 5.80 8.20 6.10

3.20 8.20 2.30 8.45 12.70 11.70 10.70 9.80

3.17 3.17 3.17 3.17 3.17 3.17 3.17 3.17

18.7 18.7 18.7 18.7 18.7 18.7 18.7 18.7

15 15 15 15 15 15 15 15

19 18.5 18.5 18.5 18.5 18.5 19 18.5

18.5 18.5 18.5 19.5 18.5 18.5 18.5 18.5

18.5 19.5 19.5 19.5 19.5 19.5 19.5 19.5

18.5 19.5 19.5 19.5 19.5 19.5 21.3 19.5

0 0 0 0 0 0 0 0

0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50

MasterGTInfo-C918_Expo

MasterGTInfo-C918_Expo Page 19

Geoconsult Asia Singapore

Page 1

Project - Contract C918 Expo Bound (TKK To BTN) INPUT PARAMETERS - TUNNEL GEOMETRY AND GROUND PROPERTIES Tunnel Geometry D cor D rel

[m] [%]

6.60 60%

[m]

4.17

P Lscrew

[m]

0.89

[m]

na

[kPa]

20.00

Overall factor of safety

q FS tot

[-]

1.20

(applied to driving forces in force equilibrium)

Air pressure FOS

FS air

[-]

1.00

(normally use 1.0 - especially in shallow ground order to avoid air blow-out)

γ cu

[-]

1.00

(applied to strength parameter, cu)

γφ

[-]

1.00

(applied to strength parameter, phi)

Minimim tail void grout pressure

ptv

[kPa]

350

Minimum nominal face pressure

Flagfpmin

[-]

Y

fpmin

[%]

30%

pair-0

[kPa]

80

10

9

7

8

2

3

Fill F1 F2 E GVI GV L GV GIV GIII GII GV50 GV70 GV90 GV120 GV150 GVI50

c' [kPa] 0.00 0.00 0.00 0.00 3.00 4.00 4.00 50.00 300.00 500.00 4.00 4.00 4.00 4.00 4.00 3.00

f [deg] 30.00 29.00 24.00 22.00 30.00 31.00 31.00 40.00 45.00 50.00 31.00 31.00 31.00 31.00 31.00 30.00

g [kN/m3] 18.70 19.00 18.50 15.00 18.50 19.50 19.50 23.00 23.00 24.00 19.50 19.50 19.50 19.50 19.50 18.50

cu [kPa] 20.00 0.00 21.00 10.00 90.00 200.00 200.00 250.00 0.00 0.00 200.00 200.00 200.00 200.00 200.00 90.00

K0 [-] 0.50 0.50 0.75 0.75 0.50 0.50 0.50 0.30 0.30 0.30 0.50 0.50 0.50 0.50 0.50 0.50

E [MPa] 7.00 13.00 5.50 1.70 37.00 60.00 90.00 300.00 3000.00 6000.00 50.00 70.00 90.00 120.00 150.00 50.00

N-1 N-2 N-3 N-4 N-5

4.00 50.00 3.00 3.00 3.00

31.00 40.00 30.00 30.00 30.00

21.30 23.50 18.50 18.50 18.50

0.00 0.00 0.00 0.00 0.00

0.50 0.50 0.50 0.50 0.50

588.50 3369.20 43.40 37.00 37.00

S-1 S-2 S-3 S-4 S-5 S-6 S-7 S-8

4.00 4.00 300.00 4.00 3.00 3.00 3.00 3.00

31.00 31.00 45.00 31.00 30.00 30.00 30.00 30.00

21.30 23.50 21.30 19.00 18.50 18.50 18.50 18.50

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

0.50 0.50 0.30 0.50 0.50 0.50 0.50 0.50

1433.10 1024.60 1476.90 62.40 43.00 3923.10 47.60 37.00

TBM diameter Cutterhead opening ratio Relevant face diameter Length of TBM cutter head Length of screw conveyor Surcharge

Soil material, partial strength factor

Nominal intial compressed air pressure

Design Parameters x

Soil / Rock Type

C918-TBM-Face Press_Expo Bound

(percent of area covered by cutting wheel)

(Yes or any other input is No) (percentage of full porewater pressure at tunnel level) (compressed air pressure to be applied initially for cutterhead intervention, applies only if free aire intervention is possible)

Input

Page 20

DOWNTOWN LINE 2 – CONTRACT C918

Revision B

Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation

Appendix

Appendix 3: Recommended Face Pressure Values

Job No. S4922

Geoconsult Asia Singapore

01/08/2012

Page 21

Geoconsult Asia Singapore

Page 1

Summary of Recommended Values Project - Contract C918 Bukit Panjang Bound(TKK To BTN) 45+809.88 1

2

3

4

1.4 5

6

7

1.2 8

Geotechnical Unit No.

Applicable Chainage

Segment Rings

9

11

12

13

TARGET Face Pressure at AXIS [kPa]

Total Octaeder stress at AXIS [kPa]

Tail Void Grout Grouting Pressure [kPa]

CALCULATED

just above CROWN

just below CROWN

at AXIS

Face Pressure at AXIS [kPa]

14

80% 15

110 16

Compressed

RECOMMENDED

MINIMUM

Hydrostatic

MAXIMUM

air Intervention Scenario [kPa]

INITIAL Compr. Air Pressure for Intervention [kPa]

INITIAL Compr. Air Pressure for Intervention [kPa]

Groundwater Pressure at AXIS [kPa]

Face Pressure at AXIS [kPa] 380 380 380 380 380 380 380 380 380 380 380 380 380 380 380 380 380 380 380 380 380 380 380 380 330 330 330 330 330 330 330 330 330 330 330 300 300 300 300 250 250 250

17

from

to

from

to

38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16b 16a 16 15 14 13 12 11 10 9 8b 8a 8 7 6 5 4 3 2 1

45+810 45+825 45+850 45+875 45+900 45+925 45+950 45+975 46+000 46+025 46+050 46+075 46+100 46+125 46+150 46+175 46+200 46+225 46+250 46+275 46+300 46+325 46+329 46+341 46+350 46+375 46+400 46+425 46+450 46+475 46+500 46+525 46+535 46+541 46+550 46+575 46+600 46+625 46+650 46+675 46+700 46+727

45+825 45+850 45+875 45+900 45+925 45+950 45+975 46+000 46+025 46+050 46+075 46+100 46+125 46+150 46+175 46+200 46+225 46+250 46+275 46+300 46+325 46+329 46+341 46+350 46+375 46+400 46+425 46+450 46+475 46+500 46+525 46+535 46+541 46+550 46+575 46+600 46+625 46+650 46+675 46+700 46+727 x

0 11 29 47 64 82 100 118 136 154 172 189 207 225 243 261 279 297 314 332 350 368 371 380 386 404 422 439 457 475 493 511 518 522 529 547 564 582 600 618 636 655

11 29 47 64 82 100 118 136 154 172 189 207 225 243 261 279 297 314 332 350 368 386 404 422 404 422 439 457 475 493 511 529 547 564 547 564 582 600 618 636 655 x

GII GV GV70 GV70 GV70 GV70 GV150 GV120 GV120 GV70 GIII GIII GV120 GV70 GV150 GV150 GIII GVI GVI GV120 GV120 GV120 GV120 GV120 GV90 GV50 GV50 GV50 GV50 GVI GVI GVI GVI GVI GVI GVI GVI GVI GVI GVI GVI GIII

GII GV70 GV70 GV70 GV150 GV150 N-1 GV120 GV120 GV70 GIII GIII GIV GV120 GV150 GV150 GIII GIII GIII GV120 GV120 GV120 GV120 GV120 GV90 GV70 GV50 GV50 GV50 GVI GVI GVI GVI GVI GVI N-3 N-3 N-3 N-3 GVI GIII GIII

GII GV70 GV70 GV70 GV150 GV150 N-1 GV150 GV150 GV150 GIII GIII GIV GV120 GV150 GV150 GIII GIII GIII GV120 GV120 GV120 GV120 GV120 GV90 GV70 GV70 GV50 GV50 GVI GVI GVI GVI GVI GV70 GV70 N-3 N-3 GV70 GVI GIII GIII

94 93 250 259 268 97 93 259 263 98 97 97 104 283 284 105 105 99 97 265 256 249 246 249 237 234 229 222 218 218 213 200 197 200 197 195 189 184 176 172 56 54

330 330 330 330 330 330 320 320 350 350 350 350 350 350 350 350 350 350 350 320 320 300 300 300 300 300 280 280 280 260 260 240 240 240 240 240 220 220 220 200 200 200

495 509 504 525 538 532 514 520 504 534 504 522 522 570 572 576 555 513 504 528 511 497 460 497 477 469 458 443 433 418 410 383 351 383 382 376 361 349 337 324 294 292

350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 366 - 500 367 - 500 367 - 500 370 - 500 370 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500

Pressure --> Pressure --> Free air possible Free air possible Free air possible Free air possible Pressure --> Pressure --> Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Pressure --> Free air possible Pressure --> Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Pressure --> Free air possible Free air possible Pressure --> Pressure --> Pressure -->

110 110 248 259 260 110 110 254 260 110 110 110 110 277 277 110 110 110 110 253 246 241 241 241 234 229 223 216 210 205 198 186 186 186 186 181 174 169 162 157 110 110

110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 67 65

312 311 310 323 325 323 309 317 325 326 324 325 345 346 346 349 349 329 323 316 308 301 301 301 293 286 279 270 263 256 248 232 232 232 232 226 218 211 203 196 188 180

1

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

NOTE 4)

NOTE 5)

NOTE 6)

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Bukit Panjang\[C918-TBM-Face Press_B.Panjang Bound_RevB.xls]Table NOTES: NOTE 1) NOTE 2) NOTE 3) 1) These pressure values are orientated on the calculated pressures and represent the recommended range. 2) Beyond this pressure level, there is a risk of heaving the ground surface; (σ1+σ2+σ3)/3 3) Recommended tail void pressure range. Actual minimum pressure is defined by method statement. Actual maximum pressure is defined by segmental lining design. 4) Recommended compressed air pressure required at the beginning of cutterhead intervention. If the ground is found stable after visual inspection at each step, the pressure can be dropped in steps to atmospheric. 5) Calculated minimum compressed air pressure for intial entry. During the air pressure reduction procesdure, face stability should be verified insitu at this pressure level.

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Bukit Panjang\C918-TBM-Face Press_B.Panjang Bound_RevB // Table

07/08/2012

Page 22

Geoconsult Asia Singapore

Page 2

Project - Contract C918 Bukit Panjang Bound(TKK To BTN) Recommended Slurry Pressure Range 400

DTSS

350 Cluny Court

CCL

300

Vl= 1.0% at Shop Houses

PRESSURE [kPa]

250

200

150

100

50 Verification Monitoring for CCL 46+010 and 45+935

0 46+800

46+700

46+600

46+500

46+400

46+300

CALCULATED Face Pressure at AXIS MINIMUM Face Pressure at AXIS RECOMMENDED TARGET Face Pressure at AXIS Hydrostatic Groundwater Pressure at AXIS CALCULATED Face Pressure at AXIS RECOMMENDED INITIAL Compr. Air Pressure for Intervention TARGET Face Pressure at AXIS MINIMUM INITIAL Compr. Air Pressure forRECOMMENDED Intervention

MINIMUM INITIAL Compr. Air Pressure for Intervention

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Bukit Panjang\C918-TBM-Face Press_B.Panjang Bound_RevB // Table

46+200

46+100

46+000

45+900

45+800

45+700

CHAINAGE Hydrostatic Groundwater Pressure at AXIS RECOMMENDED INITIAL Compr. Air Pressure for Intervention MAXIMUM Face Pressure at AXIS

07/08/2012

Page 23

Geoconsult Asia Singapore

Page 1

Summary of Recommended Values Project - Contract C918 Expo Bound (TKK To BTN) 45+809.88 1

2

3

4

1.4 5

6

7

8

Geotechnical Unit

9

38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9b 9a 9 8 7 6 5 4 3 2 1

from 45+810 45+825 45+850 45+875 45+900 45+925 45+950 45+975 46+000 46+025 46+050 46+075 46+100 46+125 46+150 46+175 46+200 46+225 46+250 46+275 46 300 46+300 46+325 46+350 46+375 46+400 46+425 46+450 46+475 46+500 46+511 46+524 46+525 46+550 46+575 46+600 46+625 46+650 46+675 46+700 46+736

to 45+825 45+850 45+875 45+900 45+925 45+950 45+975 46+000 46+025 46+050 46+075 46+100 46+125 46+150 46+175 46+200 46+225 46+250 46+275 46+300 46 325 46+325 46+350 46+375 46+400 46+425 46+450 46+475 46+500 46+511 46+524 46+525 46+550 46+575 46+600 46+625 46+650 46+675 46+700 46+736 x

from 0 11 29 47 64 82 100 118 136 154 172 189 207 225 243 261 279 297 314 332 350 368 386 404 422 439 457 475 493 501 510 511 529 547 564 582 600 618 636 661

to 11 29 47 64 82 100 118 136 154 172 189 207 225 243 261 279 297 314 332 350 368 386 404 422 439 457 475 493 501 510 511 529 547 564 582 600 618 636 661 x

GII GII GV50 GV90 GV90 GV90 GV90 GV90 GV90 GV90 GV120 GV90 GV120 GV120 GV120 GV120 GV120 GV50 GV120 GV90 GVI GVI GV90 GV90 GV50 GV50 GV70 GVI GVI GVI GVI GVI GVI GVI GVI GVI GVI GIII S-6 GVI

GII GII GV50 GV90 GV90 GV90 S-1 S-1 GV120 GV120 GV120 GV120 GV120 GV120 S-2 GV120 S-3 GV150 GV120 GV90 GV50 GV50 GV90 GV90 GV90 GV90 GV90 GV70 GV70 GVI GVI GVI S-4 S-4 S-5 GVI S-5 GIII S-6 GIII

GII GII GV50 GV90 GV120 GV120 S-1 S-1 GV120 GV120 GV120 GV120 GV120 GV150 S-2 GV150 S-3 GV150 GV120 GV90 GV50 GV50 GV90 GV90 GV90 GV90 GV90 GV70 GV70 GV50 GV50 GV50 GV70 GV70 S-5 GV50 GV50 GIII GII GIII

1

2

3

4

5

6

7

8

9

Applicable Chainage

Segment Rings

12

13

TARGET Face Pressure at AXIS [kPa] 330 330 330 330 330 340 340 340 340 340 350 350 350 350 340 340 340 340 340 320 320 300 300 280 280 280 270 270 270 270 270 270 240 240 240 240 210 210 210 210

Total Octaeder stress at AXIS [kPa] 478 475 514 513 517 547 472 487 493 498 504 518 519 515 516 494 450 483 479 465 443 422 412 405 402 383 427 406 402 366 392 392 376 371 361 344 328 312 271 274

Tail Void Grout Grouting Pressure [kPa] 350 - 500 350 - 500 350 - 500 350 - 500 355 - 500 350 - 500 350 - 500 355 - 500 356 - 500 360 - 500 369 - 500 367 - 500 364 - 500 358 - 500 351 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500 350 - 500

11

12

13

CALCULATED Face Pressure at AXIS [kPa] 90 89 256 256 258 271 96 98 275 279 282 287 289 103 101 99 97 273 269 261 251 241 234 233 233 223 214 203 202 202 202 202 191 190 190 181 172 58 52 52

No.

11

just above CROWN

just below CROWN

at AXIS

14

Compressed

RECOMMENDED

MINIMUM

Hydrostatic

MAXIMUM

air Intervention Scenario [kPa] As recommended As recommended Free air possible Free air possible Free air possible Free air possible As recommended As recommended Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible As recommended Free air possible As recommended Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible As recommended Free air possible Free air possible As recommended As recommended As recommended

INITIAL Compr. Air Pressure for Intervention [kPa] 110 110 250 248 251 267 110 110 267 268 271 278 277 110 110 110 110 259 260 255 243 234 231 225 222 214 210 202 198 192 190 190 182 178 174 163 158 110 110 110

INITIAL Compr. Air Pressure for Intervention [kPa] 108 107 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 70 62 62

Groundwater Pressure at AXIS [kPa] 300 297 312 310 314 334 320 328 334 335 339 348 346 343 337 330 322 324 325 319 304 292 289 281 277 267 262 252 247 241 237 237 227 222 217 204 197 192 175 175

Face Pressure at AXIS [kPa] 370 370 370 370 380 380 380 380 380 380 380 380 380 380 380 380 380 380 370 370 370 370 370 370 330 330 330 330 330 330 330 330 330 300 300 300 240 240 240 240

14

15

16

17

NOTE 5)

NOTE 6)

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\[C918-TBM-Face Press_Expo Bound RevB.xls]Table NOTES: NOTE 2) NOTE 3) NOTE 4) 1) These pressure values are orientated on the calculated pressures and represent the recommended range. 2) Beyond this pressure level, there is a risk of heaving the ground surface; (σ1+σ2+σ3)/3 3) Recommended tail void pressure range. Actual minimum pressure is defined by method statement. Actual maximum pressure is defined by segmental lining design. 4) Recommended compressed air pressure required at the beginning of cutterhead intervention. If the ground is found stable after visual inspection at each step, the pressure can be dropped in steps to atmospheric. 5) Calculated minimum compressed air pressure for intial entry. During the air pressure reduction procesdure, face stability should be verified insitu at this pressure level. 6) This column is provided for information. Recommended face pressure values for TBM operation are provided in Column with Note 1).

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\C918-TBM-Face Press_Expo Bound RevB // Table

1.2 110 16

80% 15

17

07/08/2012 Page 24

Geoconsult Asia Singapore

Page 2

Project - Contract C918 Expo Bound (TKK To BTN) Recommended Slurry Pressure Range 400

DTSS

350

Cluny

CCL

300

PRESSURE [kPa]

250

Shop Houses

200

150

100

50 Verification Monitoring for CCL 46+010 and 49+935

0 46+800

46+700

46+600

46+500

46+400

46+300

46+200

46+100

46+000

45+900

45+800

45+700

CHAINAGE CALCULATED Face Pressure at AXIS RECOMMENDED TARGET Face Pressure at AXIS MINIMUM INITIAL Compr. Air Pressure for Intervention

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\C918-TBM-Face Press_Expo Bound RevB // Table

Hydrostatic Groundwater Pressure at AXIS RECOMMENDED INITIAL Compr. Air Pressure for Intervention MAXIMUM Face Pressure at AXIS

07/08/2012 Page 25

DOWNTOWN LINE 2 – CONTRACT C918

Revision B

Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation

Appendix

Appendix 4: Cutter Head Intervention - Planned stoppage location - Selected analysis results

Job No. S4922

Geoconsult Asia Singapore

01/08/2012

Page 26

Geoconsult Asia Singapore

Page 1

Summary of Recommended Values - Cutterhead Interventions Project - Contract C918 Bukit Panjang Bound(TKK To BTN) 45+809.88 1

2

1.4 3

4

5

6

7

Geotechnical Unit

Cutter Head Intervention

Segment No.

Applicable Chainage

Ring

80% 9

8

1.2 110 10

just above CROWN

just below CROWN

at AXIS

at INVERT

CHI-1 CHI-2 CHI-3 CHI-4 CHI-5 CHI-6 CHI-7

from 46+636 46+430 46+341 46+280 46+131 46+020 45+870

approx. 590 443 380 336 229 150 43

GVI GV70 GV120 GV70 GV70 GV120 GV90

GV50 GV70 GV120 GV90 GV120 GV120 GV90

GV50 GV70 GV90 GV150 GIII GV150 GV90

GV70 GV70 GV120 GV150 GIII GV150 GV90

Intervention Scenario [kPa] Free air possible Free air possible Free air possible Free air possible Pressure --> Free air possible Free air possible

1

2

3

4

5

6

7

8

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\[C918-TBM-Face Press_Expo Bound RevB.xls]Table NOTE 1) NOTES: 1) Indicates whether as per design free air intervention is principally considered possible 2) If free air intervention is principlally possible, this is the minimum air pressure to be applied intially at the beginning of a cutterhead intervention 3) If flowing conditions occur, the air pressure shall be increased to the recommended face slurry pressure

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Bukit Panjang\C918-TBM-Face Press_B.Panjang Bound_RevB // Interv-Table

11

Hydrostatic

RECOMMENDED

MINIMUM

Groundwater

INITIAL Compr. Air Pressure [kPa] 166 215 241 254 110 262 253

INITIAL Compr. Air Pressure [kPa] 110 110 110 110 0 110 110

Pressure at AXIS [kPa] 208 269 301 318 343 327 316

9

10

11

NOTE 2)

NOTE 3)

07/08/2012 Page 27

Geoconsult Asia Singapore

Page 2

Project - Contract C918 Bukit Panjang Bound(TKK To BTN) Recommended Compressed Air Pressure Range for Interventions 400 350 300

PRESSURE [kPa]

250 200 150 100 50 0 46+721

46+615

46+508

46+401

46+295

46+188

46+081

45+975

45+868

45+761

CHAINAGE RECOMMENDED INITIAL RECOMMENDED Compr. Air Pressure INITIAL Compr. Air Pressure MINIMUM INITIAL Compr. Air Pressure Hydrostatic Hydrostatic Pressure at AXIS

MINIMUM INITIAL Compr. Air Pressure

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Bukit Panjang\C918-TBM-Face Press_B.Panjang Bound_RevB // Interv-Table

Hydrostatic Hydrostatic Pressure at AXIS

07/08/2012 Page 28

Geoconsult Asia Singapore

Page 1

Summary of Recommended Values - Cutterhead Interventions Project - Contract C918 Expo Bound (TKK To BTN) 45+809.88 1

2

1.4 3

4

5

6

7

Geotechnical Unit Applicable

Segment

No.

Chainage

Ring

CHI-1 CHI-2 CHI-3 CHI-4 CHI-5 CHI-6 CHI-7 CHI-8

approximately 46+635 46+380 46+276 46+132 46+035 46+005 45+980 45+870

1

2

80% 9

8

1.2 110 10

Cutter Head Intervention

just above CROWN

just below CROWN

at AXIS

at INVERT

approx. 589 407 333 230 161 139 122 43

GVI GV90 GV120 GV120 GV90 GV90 GV90 GV90

GVI GV90 GV120 GV120 GV120 GV120 S-1 GV90

GVI GV70 GV120 GV120 GV120 GV120 GV120 GV120

GV50 GV90 GV120 GV120 GIII GIII GIII GIII

Intervention Scenario [kPa] Free air possible Free air possible Free air possible Free air possible Free air possible Free air possible Pressure --> Free air possible

3

4

5

6

7

8

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\[C918-TBM-Face Press_Expo Bound RevB.xls]Table NOTE 1) NOTES: 1) Indicates whether as per design free air intervention is principally considered possible 2) If free air intervention is principlally possible, this is the minimum air pressure to be applied intially at the beginning of a cutterhead intervention 3) If flowing conditions occur, the air pressure shall be increased to the recommended face slurry pressure

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\C918-TBM-Face Press_Expo Bound RevB // Interv-Table

11

Hydrostatic

RECOMMENDED

MINIMUM

Groundwater

INITIAL Compr. Air Pressure [kPa] 163 225 255 274 110 110 110 110

INITIAL Compr. Air Pressure [kPa] 110 110 110 110 0 0 0 0

Pressure at AXIS [kPa] 204 281 319 343 335 334 328 310

9

10

11

NOTE 2)

NOTE 3)

07/08/2012 Page 29

Geoconsult Asia Singapore

Page 2

Project - Contract C918 Expo Bound (TKK To BTN) Recommended Compressed Air Pressure Range for Interventions 400 350 300

PRESSURE [kPa]

250 200 150 100 50 0 46+721

46+615

46+508

46+401

46+295

46+188

46+081

45+975

45+868

45+761

CHAINAGE RECOMMENDED INITIAL Compr. Air Compr. Pressure RECOMMENDED INITIAL Air Pressure MINIMUM INITIAL Compr. Air Pressure Hydrostatic Hydrostatic Pressure at AXIS

MINIMUM INITIAL Compr. Air Pressure

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\C918-TBM-Face Press_Expo Bound RevB // Interv-Table

Hydrostatic Hydrostatic Pressure at AXIS

07/08/2012 Page 30