Ricco Survival Y.docx

8/11/2019 Ricco Survival Y.docx

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[MEKANIKA TANAH II] December 7, 2012

R I C C O S U R V I V A L Y / 4 2 / 1 4 9 9 7 Page 1

CERNICA


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5.4 A permeable soil layer is underline by an impervious layes, as shown 5.8a.with k = 4,8 x 10 -3 cm/ s for the permeable layer, calculate the rate seepage troughit in ft 3 / hari/ ft width if H = 10 ft and O5

Answer :

K = 4,8 x 10-3 cm/sec = 0,000158 ft/sec

lengthheadloss

i

=

sin

cos

tan

L

L

Q = k1 A = (k). (sin ) (10 cos ) (1)

Q = (0,000158) (sin 5 O) (10 sin 5 O) (3600) = 0,493 ft 3/hr/ft

7.5 Given kx = kz = 30 x 10-4 cm/s. there is a 5m cutoff wall. Find the quantityof discharge q per meter width

To change to ft/hr

cos L

tan Lh

5O =

10 cos )( f t


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Procedure nf = 3,5

nd = 13

hk nd nf

.

widthmcmmcmm scm x /100./100.5,6./1030.13

5,3 4

52, 50 cm 3/s/m

9.16 Column A shown in fig. P9. 16 is part of an existing building that had been

erected long, long ago. A Mr. Doe comes along and decides to build a new

building with a basement as shown. About a year later, measurements

-----------------------------------------------------------------------------------------------------------------------------------------------------------------

6,5m

5m

5,5m

20 m

concretc

1 m

impervious

Q


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indicate that column A has settled. Assufme normally consolidated

conditions.

Jawab :

Lapisan 1 :

( )

Lapisan 2 :


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( ) ( )

Mencari jari-jari :


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11.13 Rework Problem 11.10 by using Cousinss stability chart.

(problem 11.10) is :

For the slope shown in fig. P11.10 determine the safety factor againts sliding by using the method of slices if A = 27 .o Divide the wedge into slicesapproximately r/10 wide.

Answer :

= 18.4 kN/m3

C = 44 kN/m2

= 15 O

F = ( )

( )

= ( )

( )

= = 4,88 m


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BRAJA M DAS


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6.18 Repeat problem 6.17, asumsing that a filter 4 ft thick is placed on thedownstream side we are given Vsat(f liter)= 128 lb/ft 3

Answer :

iav =( )

FS =

=

( )

= ( )( )

= 4.89


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8.7 BAB VII. Braja M Das 8.7

Following are the results of a consolidation test

e Pressure p ( )1,1 0,251,085 0,51,055 1,01,01 2,00,94 4,00,79 8,00,63 16,0

a) Plot the e log p curve b) Using Casagrandes method, determine the preconsolidation c) Calculate the compresium index Cc

Answer :

a)


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b) pc = 3,1

c) Cc =( )

( ) =

( )( )

= 0,53


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12.23 Refer Figure 12.44.Use Taylors chart for >0(Figure 12.15)to solve thefollowing:

a. If n=2, =15,c =650 lb/ft,and =115 lb/ft,find the critical heightof theslope.

b. If n=2,5, =25,c =500 lb/ft,and =115 lb/ft,find the critical heightofthe slope.

c. If n=1, =12,c =25 lb/ft,and =17 lb/ft,find the critical heightof theslope.

d. If n=1,5, =85,c =18 lb/ft,and =16,5 lb/ft,find the critical heightof theslope.

Answer:

N0 n m c(lb/ft) (lb/ft )

a. 2 26,57 15 0,04 650 115


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b. 1 45 25 0,035 500 115

c. 2,5 22,5 12 0,045 25 17

d. 1,5 33,68 18 0,045 18 16,5

a. b.

c.

d.

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Ricco Survival Y.docx