Geotechnical Engineering Module

GEOTECHNICAL ENGINEERING MODULE SITUATION 1: A uniform soil deposit !s ! dr" unit #ei$t of 1%&' (N)m * !nd ! s!tur!ted unit #ei$t of 1+&, (N)m*& Te $round #!ter t!-le is !t ! dist!n.e of / m -elo# te $round surf!.e& 0oint A is !t dept of ' m -elo# te $round surf!.e& 1&

Compute Compute te effe.ti effe.tie e s stres tress s ! !t t A A& & !& %1&2, (0! -& /3&/% (0!

.& %/&,+

d& /,&*4

,&

If te #!ter t!-le t!-le $oes up -" *&% m find te effe.tie stress !t !t A& !& //&*/ (0! -& /1&2, .& /+&/' d& /3&1,

*&

In .omp!riso .omp!rison n to 1 !nd ,5 #!t #ill #ill !ppen !ppen to te effe.tie effe.tie stresse stresses s !t A if te $round $round #!ter surf!.e #ill rise up te $round surf!.e6 !& In.re!se -& Rem!in .& De.re!se d& C!nnot -e determined

SITUATION ,: A soil s!mple #!s determined in te l!-or!tor" to !e ! li7uid limit of /18 !nd ! pl!sti. limit of ,1&18& If te #!ter .ontent is *285 /&

%&

'&

Deter Determin mine e te pl!sti pl!sti.it .it" " inde9& inde9& !& ,1&1 -& 14&4

.& 4&4

d& 11&1

Deter Determin mine e te li7u li7uidi idit" t" inde9 inde9& & !& 2&%2+ -& 2&'23

.& 2&*4/

d& 2&//+

!t is te te .!r! .!r!.ter .teristi isti. . of soil6 soil6 !& ;rittle -& Li7uid

.& Dense

d& 0l!sti.

SITUATION *: A .onsolid!ted dr!ined tri -& ,1&2+>

.& ,3&34>

d& *%&1%>

Compute Compute te norm!l norm!l stres stress s !t f!ilure& f!ilure& !& ,2/&'3 (0! -& ,1,&%4

.& ,+3&3+

d& ,%%&1%

Compute Compute te se!r se!r stress stress !t f!ilu f!ilure& re& !& 1*+&1% (0! -& 11,&4%

.& 123&%*

d& 111&*1

SITUATION /: Refer to te fi$ure& Gien 71 = *22 (N)m5 7, = ,'2 (N)m5 91 = / m5 9, = * m !nd ? = * m&

12& @ind te erti.!l erti.!l stress in.re!se in.re!se !t point A due to first line lo!d& lo!d& !& 1&+% (0! -& 1&'1 .& 1&%* d& 1&// 11& @ind te erti.!l erti.!l stress in.re!se in.re!se !t point A due to te se.ond lin line e lo!d& !& 1*&+4 (0! -& 1/&// .& 1'&+3 d& 1,&*1 1,& @ind te tot!l tot!l erti.!l stress stress !t point point A& !& 1%&%/ (0! -& 13&*4

.& 1%&*,

d& 1*&+%

SITUATION %: A .ert!in soil deposit !s ! li7uid limit of /+8 !nd ! pl!sti. limit of ,/8& 1*& Compute Compute te .oeffi.ien .oeffi.ient t of e!rt e!rt pressure pressure !t rest of tis soil deposit& deposit& Hint: o = 2&,,*lo$0I !& 2&%2+ -& 2&//+ .& 2&,*4 d& 2&*14

2&14 B

1/& Compute te tot!l stress stress !t rest l!ter!l e!rt pressure pressure ! dept of % m& in ! dense s!nd deposit #ere tis soil #!s o-t!ined& Unit #ei$t of s!nd is 13&/ (N)m *&

!& /%&** (0!

-& /'&'/

.& /3&**

d& %2&21

1%& Compute te tot!l stress !t rest l!ter!l e!rt pressure !t ! dept of % m in te s!me s!nd deposit -ut ! #!ter t!-le is lo.!ted !t ! $round surf!.e& S!tur!ted unit #ei$t of s!nd is ,2&% (N)m*& !& 3/&*1 (0! -& 32&'/ .& +'&1% d& +,&,1 SITUATION ': Spe.ifi.!tions on ! o- re7uired ! fill usin$ -orro#ed soil to -e .omp!.ted !t 4%8 of its st!nd!rd 0ro.tor m!9imum dr" densit"& Tests indi.!te t!t te m!9imum is 14&% (N)m * #it 1,8 moisture& Te -orro# m!teri!l !s ! oid r!tio of 2&'2 !nd ! solid spe.ifi. $r!it" of ,&'%& 1'& Compute te dr" unit #ei$t of te .omp!.ted soil& !& 1+&,1' (N)m* -& 13&%,% .& 1%&1*,

d& 14&+'1

1+& Compute te #et unit #ei$t of te .omp!.ted soil& !& ,1&, (N)m* -& ,2&+ .& 14&'

d& 13&%

13& @ind te re7uired minimum olume of -orro# soil re7uired to fill one .u-i. meter& !& 1&*3 m* -& 1&'% .& 1&1/ d& 1&,4 SITUATION +: Te l!-or!tor" !pp!r!tus so#n in te fi$ure m!int!ins ! .onst!nt e!d in -ot te upper !nd lo#er reseroirs& Te soil s!mple is ! silt" s!nd #it "dr!uli. .ondu.tiit" of  = % 9 12F