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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.