Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 5, Problem 5.11P
(a)
To determine
Find the degree of consolidation for the clay layer due to the sand drains after six months of surcharge application.
(b)
To determine
Find the degree of consolidation for the clay layer due to the combination of vertical and radial drainage.
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Consider the soil profile below:
3m
Vary
18.3kN/m
Sand
Groundwater table
6m
-19.8kN/m²
4m
Clay
Sand
Calculate the effective stress at the location of the red star (4m inside clay layer) if the saturated unit weight of the clay is 21.8 kN/m^3
Note: give your answer in units of kPa
A sample of the clay layer in the previous problem is extracted from the location of the red star and tested in the lab.
Vertical strain, &, (%)
1
50
40
10
100
1000
Effective consolidation stress, σ (kPa)
Odometer testing yielded the following consolidation curve (red line):
Calculate the over-consolidation ratio of the clay sample. Use two decimal places.
Note: this question is part of soil mechanics
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Note: the two questions are connected as parts so please answer soil mechanics question as best you can !.
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Chapter 5 Solutions
Principles of Foundation Engineering (MindTap Course List)
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