Solutions Manual Principles of Foundation Engineering 9th Edition by Braja M. Das and Nagaratnam

Solutions Manual Principles of Foundation Engineering 9th Edition by Braja M. Das and
Nagaratnam




Solutions Manual Principles of Foundation Engineering 9th Edition by Braja M. Das and
Nagaratnam

,Solutions Manual Principles of Foundation Engineering 9th Edition by Braja M. Das and Nagaratnam




SOLUTIONS MANUAL
For


Principles of Foundation
Engineering
Ninth Edition


BRAJA M. DAS


NAGARATNAM SIVAKUGAN




Solutions Manual Principles of Foundation Engineering 9th Edition by Braja M. Das and Nagaratnam



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,Solutions Manual Principles of Foundation Engineering 9th Edition by Braja M. Das and Nagaratnam


Contents

Chapter 2 ..............................................................................................................................1

Chapter 3 ............................................................................................................................11

Chapter 5 ............................................................................................................................23

Chapter 6 ............................................................................................................................31

Chapter 7 ............................................................................................................................49

Chapter 8 ............................................................................................................................59

Chapter 9 ............................................................................................................................69

Chapter 10 ..........................................................................................................................83

Chapter 11 ..........................................................................................................................89

Chapter 12 ..........................................................................................................................91

Chapter 13 ........................................................................................................................ 113

Chapter 14 ........................................................................................................................ 123

Chapter 15 ........................................................................................................................ 125

Chapter 16 ........................................................................................................................ 131

Chapter 17 ........................................................................................................................ 141

Chapter 18 ........................................................................................................................ 153

Chapter 19 ........................................................................................................................ 171




Solutions Manual Principles of Foundation Engineering 9th Edition by Braja M. Das and Nagaratnam

, Solutions Manual Principles of Foundation Engineering 9th Edition by Braja M. Das and Nagaratnam




Chapter 2

2.1 From Eq. (2.18),
Gs ρw 2450 2.80 1000
ρ = = = ; e = 0.0571
d 1+ e 0.925 1+ e
From Eq. (2.6),
e
Porosity, n = =
0.0571 = 0.054
1+ e 1+ 0.0571


2.2 From Eq. (2.13), the dry density
ρ 2060
ρd = = = 1786.6 kg/m3
1 + w 1 + 0.153
Gs ρw
From Eq. (2.18), ρ =
d 1+ e
Gs ρw 2.70 1000
e= −1 = − 1 = 0.511
ρd 1786.6
Once saturated, from Eq. (2.19),
(Gs + e) (2.70 + 0.511)
ρsat = ρw = 1000 = 2125.1 kg/m3
(1 + e) (1 + 0.511)


2.3 Let’s consider a 1-m2 area in plan. The initial volume of this soil is
V = 1 × 0.5 = 0.5 m3. Volume of the solids is Vs.
0.5 −Vs
e = 0.9 = ; Vs = 0.2632 m3
Vs
Ws = 0.2632 × 2.68 × 9.81 = 6.919 kN
The new volume after compaction = 1 × 0.455 = 0.455 m3
6.919
The dry unit weight, γ = = 15.21 kN/m3
d
0.455
Gsγw
From Eq. (2.12), γd =
1+ e


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