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In the soil profile shown, the clay layer is normally consolidated and the ground water location maybe assumed to remain constant. The raft foundation is 15 m x 15 m with a uniform loading of 192 kPa. a) Compute the initial effective stress at the mid-point of clay layer. b) Compute the change in stress at the mid-point of the clay layer if it has an influence factor of 0.90. c) Compute the approximate settlement due to placement of the raft foundation.

In the soil profile shown, the clay layer is normally consolidated and the ground water location maybe assumed to remain constant. The raft foundation is 15 m x 15 m with a uniform loading of 192 kPa. a) Compute the initial effective stress at the mid-point of clay layer. b) Compute the change in stress at the mid-point of the clay layer if it has an influence factor of 0.90. c) Compute the approximate settlement due to placement of the raft foundation.

Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter9: Consolidation
Section: Chapter Questions
Problem 9.17P
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In the soil profile shown, the clay layer is normally consolidated and the ground water location maybe assumed to remain constant. The raft foundation is 15 m x 15 m with a uniform loading of 192 kPa. a) Compute the initial effective stress at the mid-point of clay layer. b) Compute the change in stress at the mid-point of the clay layer if it has an influence factor of 0.90. c) Compute the approximate settlement due to placement of the raft foundation.

4.5 m Silty sand Va = 17 kN/m³ w = 8.2 % 1.5 m 1.5 m w = 16.1 %% Clay la = 18.6 kN/m³ w = 15.3 % G, = 2.68 C = 0.41 3 m Poorly graded gravel 15 m = 20.7 kN/m³ Rock
Transcribed Image Text:4.5 m Silty sand Va = 17 kN/m³ w = 8.2 % 1.5 m 1.5 m w = 16.1 %% Clay la = 18.6 kN/m³ w = 15.3 % G, = 2.68 C = 0.41 3 m Poorly graded gravel 15 m = 20.7 kN/m³ Rock
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