SOLUTIONS MANUAL
For
Fundamentals of
Geotechnical
Engineering
FIFTH EDITION
BRAJA M. DAS
NAGARATNAM SIVAKUGAN
NOTE: There is no Solution Manual for Chapter 1
, Chapter 2
2.1 a. True
b. False
c. True
d. True
e. True
2.2 a. Sieve Mass of soil retained Percent retained Percent
No. on each sieve (g) on each sieve finer
4 0.0 0.0 100.0
10 18.5 4.4 95.6
20 53.2 12.6 83.0
40 90.5 21.5 61.5
60 81.8 19.4 42.1
100 92.2 21.9 20.2
200 58.5 13.9 6.3
Pan 26.5 6.3 0
Σ421.2 g
The grain-size distribution is shown.
b. From the graph, D60 = 0.4 mm; D30 = 0.22 mm; D10 = 0.12 mm
1
© 2017 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
, D60 0 .4
c. Cu = = = 3.33
D10 0.12
( D30 )2 (0.22)2
d. Cc = = = 1.01
( D10 )( D60 ) (0.4)(0.12)
D60 0.41
2.3 Cu = = = 5.13
D10 0.08
( D30 )2 (0.22)2
Cc = = = 1.48
( D10 )( D60 ) (0.08)(0.41)
D60 1.81
2.4 Cu = = = 7.54
D10 0.24
( D30 )2 (0.82)2
Cc = = = 1.55
( D10 )( D60 ) (0.24)(1.81)
2.5 a. Sieve Mass of soil retained Percent retained Percent
No. on each sieve (g) on each sieve finer
4 0 0 100
6 0 0 100
10 0 0 100
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 3.10 4.7
Pan 23.5 4.70 0
Σ500 g
The grain-size distribution is shown on the next page.
2
© 2017 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
, b. From the graph, D60 = 0.48 mm, D30 = 0.33 mm, D10 = 0.23 mm
0.48
c. Cu = = 2.09
0.23
(0.33)2
d. Cc = = 0.99
(0.48)( 0.23)
2.6 a. Sieve Mass of soil retained Percent retained Percent
No. on each sieve (g) on each sieve finer
4 0 0 100
10 44 7.99 92.01
20 56 10.16 81.85
40 82 14.88 66.97
60 51 9.26 57.71
80 106 19.24 38.47
100 92 16.70 21.77
200 85 15.43 6.34
Pan 35 5.34 0
Σ 551 g
The grain-size distribution is shown on the next page.
3
© 2017 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
For
Fundamentals of
Geotechnical
Engineering
FIFTH EDITION
BRAJA M. DAS
NAGARATNAM SIVAKUGAN
NOTE: There is no Solution Manual for Chapter 1
, Chapter 2
2.1 a. True
b. False
c. True
d. True
e. True
2.2 a. Sieve Mass of soil retained Percent retained Percent
No. on each sieve (g) on each sieve finer
4 0.0 0.0 100.0
10 18.5 4.4 95.6
20 53.2 12.6 83.0
40 90.5 21.5 61.5
60 81.8 19.4 42.1
100 92.2 21.9 20.2
200 58.5 13.9 6.3
Pan 26.5 6.3 0
Σ421.2 g
The grain-size distribution is shown.
b. From the graph, D60 = 0.4 mm; D30 = 0.22 mm; D10 = 0.12 mm
1
© 2017 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
, D60 0 .4
c. Cu = = = 3.33
D10 0.12
( D30 )2 (0.22)2
d. Cc = = = 1.01
( D10 )( D60 ) (0.4)(0.12)
D60 0.41
2.3 Cu = = = 5.13
D10 0.08
( D30 )2 (0.22)2
Cc = = = 1.48
( D10 )( D60 ) (0.08)(0.41)
D60 1.81
2.4 Cu = = = 7.54
D10 0.24
( D30 )2 (0.82)2
Cc = = = 1.55
( D10 )( D60 ) (0.24)(1.81)
2.5 a. Sieve Mass of soil retained Percent retained Percent
No. on each sieve (g) on each sieve finer
4 0 0 100
6 0 0 100
10 0 0 100
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 3.10 4.7
Pan 23.5 4.70 0
Σ500 g
The grain-size distribution is shown on the next page.
2
© 2017 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
, b. From the graph, D60 = 0.48 mm, D30 = 0.33 mm, D10 = 0.23 mm
0.48
c. Cu = = 2.09
0.23
(0.33)2
d. Cc = = 0.99
(0.48)( 0.23)
2.6 a. Sieve Mass of soil retained Percent retained Percent
No. on each sieve (g) on each sieve finer
4 0 0 100
10 44 7.99 92.01
20 56 10.16 81.85
40 82 14.88 66.97
60 51 9.26 57.71
80 106 19.24 38.47
100 92 16.70 21.77
200 85 15.43 6.34
Pan 35 5.34 0
Σ 551 g
The grain-size distribution is shown on the next page.
3
© 2017 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
