A 5m thick clay (Gs = 2.65, water content = 0.28) is overlain by a 4.5m thick layer of sand (Gs = 2.60, e = 0.70, S = 0.85). The ground water table is locate 4.5m from the ground surface. 1. at what depth would the vertical effective stress be equal to 120kpa? 2. what is the vertical effective stress at a depth 9m below the ground surface? 3. what depth of excavation required to reduce the effective stress at the bottom of the clay layer by 100kpa?

A 5m thick clay (Gs = 2.65, water content = 0.28) is overlain by a 4.5m thick layer of sand (Gs = 2.60, e = 0.70, S = 0.85). The ground water table is locate 4.5m from the ground surface. 1. at what depth would the vertical effective stress be equal to 120kpa? 2. what is the vertical effective stress at a depth 9m below the ground surface? 3. what depth of excavation required to reduce the effective stress at the bottom of the clay layer by 100kpa?

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter8: Vertical Stress Increase In Soil

Section: Chapter Questions

Problem 8.3P: A point load of 1000 kN is applied at the ground level. Plot the variation of the vertical stress...

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A 5 m-thick clay (Gs = 2.65, water content = 0.28) is overlain by a 4.50m-thick layer of sand (Gs = 2.60, e = 0.70, S = 0.85). The ground water table is located 4.50 m from the ground surface. Compute for the following: 1. At what depth would the vertical effective stress be equal to 120 kPa? 2. What is the vertical effective stress at a depth 9 m below the ground surface? 3. The depth of excavation required to reduce the effective stress at the bottom of the clay layer by 100 kPa.
A 3 m-thick sand layer is underlain by a deep bed of clay where the water content is 29%. The water table is at the bottom of the sand layer. The unit weight of sand is 18 kN/m3, and Gs for clay grains is 2.70. Find the effective vertical stress at a depth 10 m below the ground level.
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