Solution Manual for Principles of Geotechnical Engineering 10th Edition (SI Version) by Braja Das – Fully Solved Problems

, Contents
Chapter Page

2 ........................................................................................................................................... 1

3 ......................................................................................................................................... 11

4 ......................................................................................................................................... 19

5 ......................................................................................................................................... 25

6 ......................................................................................................................................... 31

7 ......................................................................................................................................... 41

8 ......................................................................................................................................... 51

9 ......................................................................................................................................... 57

10 ........................................................................................................................................ 69

11 ........................................................................................................................................ 83

12 ........................................................................................................................................ 99

13 ...................................................................................................................................... 109

14 ...................................................................................................................................... 121

15 ...................................................................................................................................... 127

16 ...................................................................................................................................... 141

17 ...................................................................................................................................... 153

, Chapter 2

D60 0.42 D302 0.212
2.1 Cu 2.625 2.63 ; 0.656 0.66
D10 C (D60 )(D10 )
c
(0.42)(0.16)
1.16


D60 0.81 0.41
2.2 C 3.0 ; C 30
2 0.768 0.77
2
D
u c
D10 0.2 (D60 )(D10 ) (0.81)(0.27)
7


2.3 a.
Sieve Mass of soil retained Percent retained Percent
no. on each sieve (g) on each sieve finer
4 28 4.54 95.46
10 42 6.81 88.65
20 48 7.78 80.88
40 128 20.75 60.13
60 221 35.82 24.31
100 86 13.94 10.37
200 40 6.48 3.89
Pan 24 3.89 0.00
617 g




1
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, b. D10 = 0.16 mm; D30 = 0.29 mm; D60 = 0.45 mm

D60 0.45
c. Cu 2.812 2.81
D10 0.16

2
D30 0.292
d. Cc 1.168 1.17
(D60 )(D10 ) (0.45)(0.16)



2.4 a.
Sieve Mass of soil retained Percent retained Percent
no. on each sieve (g) on each sieve Finer
4 0 0.0 100.00
6 30 6.0 94.0
10 48.7 9.74 84.26
20 127.3 25.46 58.80
40 96.8 19.36 39.44
60 76.6 15.32 24.12
100 55.2 11.04 13.08
200 43.4 8.68 4.40
Pan 22 4.40 0.00
500 g




b. D10 = 0.13 mm; D30 = 0.3 mm; D60 = 0.9 mm


2
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, D60 0.9
c. Cu 6.923 6.92
D10 0.1
3

2
D302 0.3
0.769 0.77
d. Cc
(D60 )(D10 )
(0.9)(0.13)


2.5 a.
Sieve Mass of soil retained Percent retained Percent
no. on each sieve (g) on each sieve finer
4 0 0.0 100.00
10 40 5.49 94.51
20 60 8.23 86.28
40 89 12.21 74.07
60 140 19.20 54.87
80 122 16.74 38.13
100 210 28.81 9.33
200 56 7.68 1.65
Pan 12 1.65 0.00
729 g




b. D10 = 0.17 mm; D30 = 0.18 mm; D60 = 0.28 mm

D60 0.28
c. Cu 1.647 1.65
D10 0.17
3
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, 2
D30 0.182
d. Cc 0.68
(D60 )(D10 ) (0.28)(0.17)


2.6 a.
Sieve Mass of soil retained Percent retained Percent
no. on each sieve (g) on each sieve finer
4 0 0.0 100.00
6 0 0.0 100.00
10 0 0.0 100.00
20 9.1 1.82 98.18
40 249.4 49.88 48.3
60 179.8 35.96 12.34
100 22.7 4.54 7.8
200 15.5 3.1 4.7
Pan 23.5 4.7 0.00
500 g




b. D10 = 0.21 mm; D30 = 0.39 mm; D60 = 0.45 mm

D60 0.45
c. Cu 2.142 2.14
D10 0.21
2 2
D30 0.39 1.609 1.61
d. Cc
(D60 )(D10 ) (0.45)(0.21)

4
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,2.7 a.




b. Percent passing 2 mm = 100 GRAVEL: 100 – 100 = 0%
Percent passing 0.06 mm = 73 SAND: 100 – 73 = 27%
Percent passing 0.002 mm = 9 SILT: 73 – 9 = 64%
CLAY: 9 – 0 = 9%


c. Percent passing 2 mm = 100 GRAVEL: 100 – 100 = 0%
Percent passing 0.05 mm = 68 SAND: 100 – 68 = 32%
Percent passing 0.002 mm = 9 SILT: 68 – 9 = 59%
CLAY: 9 – 0 = 9%


d. Percent passing 2 mm = 100 GRAVEL: 100 – 100 = 0%
Percent passing 0.075 mm = 80 SAND: 100 – 80 = 20%
Percent passing 0.002 mm = 9 SILT: 80 – 9 = 71%
CLAY: 9 – 0 = 9%




5
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,2.8 a.




b. Percent passing 2 mm = 100 GRAVEL: 100 – 100 = 0%
Percent passing 0.06 mm = 30 SAND: 100 – 30 = 70%
Percent passing 0.002 mm = 5 SILT: 70 – 5 = 65%
CLAY: 5 – 0 = 5%


c. Percent passing 2 mm = 100 GRAVEL: 100 – 100 = 0%
Percent passing 0.05 mm = 28 SAND: 100 – 28 = 72%
Percent passing 0.002 mm = 5 SILT: 72 – 5 = 67%
CLAY: 5 – 0 = 5%


d. Percent passing 2 mm = 100 GRAVEL: 100 – 100 = 0%
Percent passing 0.075 mm = 34 SAND: 100 – 34 = 66%
Percent passing 0.002 mm = 5 SILT: 66 – 5 = 61%
CLAY: 5 – 0 = 5%




6
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,2.9 a.




b. Percent passing 2 mm = 100 GRAVEL: 100 – 100 = 0%
Percent passing 0.06 mm = 84 SAND: 100 – 84 = 16%
Percent passing 0.002 mm = 28 SILT: 84 – 28 = 56%
CLAY: 28 – 0 = 28%


c. Percent passing 2 mm = 100 GRAVEL: 100 – 100 = 0%
Percent passing 0.05 mm = 83 SAND: 100 – 83 = 17%
Percent passing 0.002 mm = 28 SILT: 83 – 28 = 55%
CLAY: 28 – 0 = 28%


d. Percent passing 2 mm = 100 GRAVEL: 100 – 100 = 0%
Percent passing 0.075 mm = 90 SAND: 100 – 90 = 10%
Percent passing 0.002 mm = 28 SILT: 90 – 28 = 62%
CLAY: 28 – 0 = 28%




7
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, 2.1 a.
0




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