Answered: The excess pore water pressure at 10…

The excess pore water pressure at 10 days after the application of a vertical stress of 100 kPa on a soil is 20 kPa. The change in * vertical effective stress is 100 O 120 O 80

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter10: Stresses In A Soil Mass

Section: Chapter Questions

Problem 10.21P: Refer to Figure 10.48. If R = 4 m and hw = height of water = 5 m, determine the vertical stress...

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Question

The excess pore water pressure at 10 days
after the application of a vertical stress of
100 kPa on a soil is 20 kPa. The change in
vertical effective stress is
100 O
120
80

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The water table is lowered from a depth of 3 m to a depth of 6 m in a deposit of silt. The silt remains saturated even after the water table is lowered. What would be the increase in the effective stress in kPa at a depth of 3 m and at 10 m on account of lowering of the water table? Assume the water content as 27% and grain specific gravity 2.67. a.29.43 b.88.29 c.117.72 d.58.86
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Question 20 A soil profile consists of sand (5-m thick) which overlies a layer of clay (9-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer? For sand layer: Void Ratio = 0.82, Specific gravity = 2.68, Degree of Saturation = 0.6 For clay layer: Void Ratio = 0.92, Specific gravity = 2.86 Round off to two decimal places.
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A soil profile consists of sand (5-m thick) which overlies a layer of clay (4-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer? For sand layer: Void Ratio = 0.82, Specific gravity = 2.75, Degree of Saturation = 0.76 For clay layer: Void Ratio = 1.09, Specific gravity = 2.76