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 17, Problem 17.4P
To determine
Find the average elastic settlement of the foundation.
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A rigid foundation is subjected to a vertical column load, P = 355 kN, as shown in Figure 1. Estimate the
elastic settlement due to the net applied pressure, Ao, on the foundation. Given: B = 2m; L= 3m; Df=1.5m;
H = 4m; Es = 13,500 kN/m²; and µs
= 0.4.
P
Foundation
Ao.
B× L
Soil
µ = Poisson's ratio
E,
modulus of elasticity: H
Rock
=
Figure 2 shows a rectangular shallow foundation. The foundation measures 1.5 m x3 m
(B x L) in plan. The clay layer is normally consolidated with: Ce=0.27; He 3 m; e
0.92; average effective stress on the clay layer due to applied foundation load Ao=24
kN/m². Determine the primary consolidation settlement of the foundation.
Sand
Y = 16.5 kN/m³
Sand
Yat 17.8 kN/m³
Normally consolidated clay
Ysat
18.2 kN/m³
= 0.92; C = 0.27
170 kN/m²
1m
1.5 m
Ground water table
---
---
15 m
3 m
Foundation
Ao
Bx L
Soil
u, = Poisson's ratio
E, =
= modulus of elasticity H
Rock
Figure 11.43
11.2 Refer to Figure 11.43. A square rigid foundation measuring 1.8 m x 1.8 m in
plan is supported by 8 m (H) of layered soil with the following characteristics:
Layer type
Thickness (m) E, (kKN/m?) Ya (KN/m?)
Loose sand
0-2
20,680
17.6
Medium clay
Dense sand
2- 4.5
7580
18.3
19.1
4.5 – 8
58,600
Given that P = 450 kN; D; = 1 m; and u,
settlement of the foundation.
= 0.3 for all layers, estimate the elastic
O Cngagelamirg 2014
©Cengage Learring 2014
Chapter 17 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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