Gabion wall Typical design sheet-Front-19-8-2008.xls

Disfor() Example: x= y= z=

0.5 12 23

a= #NAME? = 13.42

Formul in B7 is =disfor(B8)

b = #NAME? = 309.5

Formul in B10 is =disfor(B11)

c = #NAME? = #NAME? = 322.9

Formul in B13 is =disfor(B8)&" + "&disfor(B11) Formul in B14 is =disfor(B15)

Design of Gabion wall Given Data(Refer to cross section) Wall Height Angle of friction for backfill Surcharge Width of the base Backfill slope angle Backface slope angle Soil friction factor Soil density Gabion fill density Soil bearing capacity Angle of wall friction

H φ q B α β µ ws wg pb δ

= = = = = = = = = = =

7 30 15.000 4.5 0 -6 0.7 22 16 407 0

ka=

0.295

m deg KN/m2 m deg deg 3

KN/m 3 KN/m 2 KN/m deg

Determine if Safety factors are within limits: Pressure coefficient, ka

Active earth force, Pa Pa=

189.980 KN/m

Ph=

188.940 KN/m

da=

2.054 m

Horizontal component, Ph

Vertical distance to Ph,da

Overturning Moment check Mo=

388.083 KNm per m

Wg=

384.000 KN/m

dg=

2.667 m

Weight of gabions for a 1-meter unit length,Wg is

Horizontal distance to Wg is dg= ∑Ax/∑A

Resisting Moment,Mr Mr=

1024.128 KNm per m

Saftey Factor against overturning SFo=Mr/Mo

SFo=

2.639

SFo=Mr/Mo > 2

OK

Safety factor against sliding SFs=µWg/Ph

SFs=

1.423 SFs > 1.4 OK

Reaction eccentricity,e e=

0.594 m

For the resultant force to lie in the middle third : -B/6