Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 11, Problem 11.3P
To determine
Find the height at which the concrete cube should be raised and dropped for densifying the granular soil of 10-m depth.
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As shown in the figure given below, a 5 m thick layer of silty sand overlies a clay layer 3 m in
thickness. Below the clay layer, there lies a 4 m thick gravelly sand layer underlain by pervious
bedrock. The ground water table is at the ground surface.
GWT
Silty Sand
5 m
Ya = 18 kN/m³
Ys = 19 kN/m3
Clay
1.5 m
3 m
Ys = 18 kN/m3
x A
Gravelly Sand
Ys = 20 kN/m3
2 m
4 m
x B
WXXX
a) Calculate the total stress (0), pore water pressure (u) and effective stress (o') at points "A"
and “B". Show your work and tabulate the results in the following form.
Point A
Point B
o (kPa)
u (kPa)
o' (kPa)
b) If ground water table is lowered by 2 m for foundation excavation purposes, calculate the
total stress, pore water pressure and effective stress at points "A" and "B" (i) immediately after,
(ii) long time after lowering the water table. Show your work and tabulate the results in the
following form.
The soil profile shown in the figure consist of a 9m layer of sand underlain by a 6m layer of clay. The location of water table is 3m from the ground level. The building to be constructed will cause an additional an additional pressure of 60 kPa on the ground. What is the primary settlement of the clay layer if:
a. Clay is normally consolidated
b. Preconsolidated pressure Pc=200 kPa
c. Preconsolidated pressure Pc= 160 kPa
A structure is built on a normally consolidated clay of thickness of H(m), where H
is the last digit of your student identity number (SID). If the last digit of your SID is
zero, take H = 10m. The normally consolidated clay has a natural moisture content of
45% and a Liquid limit of 50%. Ground investigation results show that the clay is
overlain by a 15m layer of sand, and the ground water table is at 10m below ground
level. The submerged unit weight and bulk unit weight of the sand layer are 15 kN/m³
and 20 kN/m³ respectively. The vertical stress increase at the centre of the clay layer
is 100kPa due to the weight of the structure. Calculate the settlement of the structure
due to primary consolidation. Take G =2.7.
Chapter 11 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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