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D 7 0 2 8 7 ) 4
(P a g e s : 3 )
R e g N o . . . . ; . ' .
F I F T H S E M E S T E R B T E C H (E N G I N E E R I N G ) (0 9 S C H E M E ) D E G R E E
E X A M I N A T I O N ,
N O V E M B E R 2 0 14
C E / P T C E 0 9 5 0 4 G E O T E CH N I CA L E N G I N E E R I N G I
T im e : T h r e e H o u r s M a x i m u m : 7 0 M a r l£s
P a r t A
A n s t u e r a u q u e s t io n s
D i ffe r e n t i a t e be t w e e n r e s i du a l s o i l a n d t r a n s p o r t e d s o i l
2 D i s t i n g u i s h be t w e e n r e l a t iv e d e n s i t y a n d r e l a t i v e c o n s i s t e n c y
3 St a t e t h e a dv a n t a g e s o f d ir e c t s h e a r t e s t s
4 (
D e f i n e c o e f fic i e n t o f v o l u m e c h a n g e a n d c o e f fic i e n t o f c o m p r e s s i bi l i t y
B r i n g o u t t h e d i f f e r e n c e s be t w e e n a c t i v e a n d p a s s iv e e a r t h p r e s s u r e c o n di t i o n s
(5 × 2 = 10 m a r k e )
P a r t B
A n s t u e r a n y t o u r q u e s t i o n s
A c l a y s o i l h a s a l i q u i d l i m i t o f 5 2 % T h e v o l u m e o f t h e s o i l s a m p le i n t h e s h r i n k a g e di s h a t t h e
l i q u i d l i m i t i s 0 0 4 0 1 × 10 3
.
3
a n d i t s h r i n k s t o a v o l u m e o f 0 02 6 1 × 10. 3
.
3
a t t h e s h r i n k a g e l i m i t
T h e s p e c i fi c g r a v i t y o f t h e s o l i d s i s 2 7 2 D e t e r m i n e t h e s h r i n k a g e l i m i t o f t h e s o i l
A l a y e r o f s a n d 8 m t h i c k l i e s a bo v e a l a y e r o f c l a y T h e w a t e r t a bl e i s a t a d e p t h o f 1 m b e l o w t h e
s u r f a c e A bo v e t h e w a t e r t a ble ,
t h e s a n d i s s a t u r a t e d w i t h c a p p i l l a r y m o i s t u r e T h e s a t u r a t e d
u n i t w e i gh t o f s a n d i s 2 0 k N /m
3
a n d i t s dr y u n i t w e igh t i s 17 k N /m
3
P l o t t h e t o t a l s t r e s s ,
n e u t r a l
s t r e s s a n d e fl c c t i v e s t r e s s w i t h d e p t h u p t o a de p t h o f 8 m
T w o s a m p l e s o f s o i l w e r e t e s t e d i n a t r i a x i a l m a c h i n e T h e a ll r o u n d p r e s s u r e m a i n t a i n e d fo r t h e
fi r s t s a m p l e w a s 2 0 0 k N / m
2
a n d fa ilu r e o c c u r r e d a t a n a d di t i o n a l a x i a l s t r e s s o f 770 k N /m
2
F o r t h e s e c o n d s a m p l e t h e s e v a l u e s w e r e 500 k N /m
2
a n d 13 70 k N /m
2
,
r e s p e ct i v e l y F i n d C a n d ¢ o f
t h e s o i l
4 T h e a v e r a ge e f fe c t i v e p r e s s u r e i n a n o r m a lly c o n s o l id a t e d c l a y l a y e r 3 m t h i c k i s d o u b le d d u e t o
t h e c o n s t r u c t i o n o f a s t r u c t u r e T h e in i t i a l v o id r a t i o o f t h e c l a y i s 1 0 a n d i t s li q u i d lim i t i s 54 %
Ca lc u l a t e t h e c o n s o li d a t i o n s e t t l e m e n t o f t h e c l a y l a y e r
A n e a r t h e n e m b a n k m e n t i s t o be c o m p a c t e d t o a dr y d e n s it v o f 18 k N /m
3
a t a p l a c e m e n t w a t e r
c o n t e n t o f 12 % T h e s o i l fo r t h e e m ba n k m e n t i s t o be t a k e n o u t o f a bo r r o w a r e a h a v i n g a bu lk
d e n s i t y o f 16 8 k N /m
3
a n d m o i s t u r e c o n t e n t o f 12% H o w m u c h v o l u m e o f bo r r o w s o il i s t o be t o
fo r m 100 m
3 m c o m p a c t e d fi l l ?
T u r n o v e r
1
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  • 3. Scanned by CamScanner D 7 0 2 8 7 ) 4 (P a g e s : 3 ) R e g N o . . . . ; . ' . F I F T H S E M E S T E R B T E C H (E N G I N E E R I N G ) (0 9 S C H E M E ) D E G R E E E X A M I N A T I O N , N O V E M B E R 2 0 14 C E / P T C E 0 9 5 0 4 G E O T E CH N I CA L E N G I N E E R I N G I T im e : T h r e e H o u r s M a x i m u m : 7 0 M a r l£s P a r t A A n s t u e r a u q u e s t io n s D i ffe r e n t i a t e be t w e e n r e s i du a l s o i l a n d t r a n s p o r t e d s o i l 2 D i s t i n g u i s h be t w e e n r e l a t iv e d e n s i t y a n d r e l a t i v e c o n s i s t e n c y 3 St a t e t h e a dv a n t a g e s o f d ir e c t s h e a r t e s t s 4 ( D e f i n e c o e f fic i e n t o f v o l u m e c h a n g e a n d c o e f fic i e n t o f c o m p r e s s i bi l i t y B r i n g o u t t h e d i f f e r e n c e s be t w e e n a c t i v e a n d p a s s iv e e a r t h p r e s s u r e c o n di t i o n s (5 × 2 = 10 m a r k e ) P a r t B A n s t u e r a n y t o u r q u e s t i o n s A c l a y s o i l h a s a l i q u i d l i m i t o f 5 2 % T h e v o l u m e o f t h e s o i l s a m p le i n t h e s h r i n k a g e di s h a t t h e l i q u i d l i m i t i s 0 0 4 0 1 × 10 3 . 3 a n d i t s h r i n k s t o a v o l u m e o f 0 02 6 1 × 10. 3 . 3 a t t h e s h r i n k a g e l i m i t T h e s p e c i fi c g r a v i t y o f t h e s o l i d s i s 2 7 2 D e t e r m i n e t h e s h r i n k a g e l i m i t o f t h e s o i l A l a y e r o f s a n d 8 m t h i c k l i e s a bo v e a l a y e r o f c l a y T h e w a t e r t a bl e i s a t a d e p t h o f 1 m b e l o w t h e s u r f a c e A bo v e t h e w a t e r t a ble , t h e s a n d i s s a t u r a t e d w i t h c a p p i l l a r y m o i s t u r e T h e s a t u r a t e d u n i t w e i gh t o f s a n d i s 2 0 k N /m 3 a n d i t s dr y u n i t w e igh t i s 17 k N /m 3 P l o t t h e t o t a l s t r e s s , n e u t r a l s t r e s s a n d e fl c c t i v e s t r e s s w i t h d e p t h u p t o a de p t h o f 8 m T w o s a m p l e s o f s o i l w e r e t e s t e d i n a t r i a x i a l m a c h i n e T h e a ll r o u n d p r e s s u r e m a i n t a i n e d fo r t h e fi r s t s a m p l e w a s 2 0 0 k N / m 2 a n d fa ilu r e o c c u r r e d a t a n a d di t i o n a l a x i a l s t r e s s o f 770 k N /m 2 F o r t h e s e c o n d s a m p l e t h e s e v a l u e s w e r e 500 k N /m 2 a n d 13 70 k N /m 2 , r e s p e ct i v e l y F i n d C a n d ¢ o f t h e s o i l 4 T h e a v e r a ge e f fe c t i v e p r e s s u r e i n a n o r m a lly c o n s o l id a t e d c l a y l a y e r 3 m t h i c k i s d o u b le d d u e t o t h e c o n s t r u c t i o n o f a s t r u c t u r e T h e in i t i a l v o id r a t i o o f t h e c l a y i s 1 0 a n d i t s li q u i d lim i t i s 54 % Ca lc u l a t e t h e c o n s o li d a t i o n s e t t l e m e n t o f t h e c l a y l a y e r A n e a r t h e n e m b a n k m e n t i s t o be c o m p a c t e d t o a dr y d e n s it v o f 18 k N /m 3 a t a p l a c e m e n t w a t e r c o n t e n t o f 12 % T h e s o i l fo r t h e e m ba n k m e n t i s t o be t a k e n o u t o f a bo r r o w a r e a h a v i n g a bu lk d e n s i t y o f 16 8 k N /m 3 a n d m o i s t u r e c o n t e n t o f 12% H o w m u c h v o l u m e o f bo r r o w s o il i s t o be t o fo r m 100 m 3 m c o m p a c t e d fi l l ? T u r n o v e r 1