For a site, there is a layer of sand, 5.3m thick, that lies over a clay layer of 1.2m. The water table is 1.3m below the ground surface. The saturated unit weights of the sand and clay are 21.6 kN/m3 and 18.8 kN/m3, respectively. The unit weight of sand above the water table is 17.2 kN/m3.Determine the total vertical stress, porewater pressure and effective vertical stress at the bottom of each layer.Plot the values found in (a) against the depth below ground level.If the water table rises up to an elevation of 0.7 m above the ground level, what will the total vertical stress, pore water pressure and effective vertical stress at the bottom of the clay layer?

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Answered: For a site, there is a layer of sand,…

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter8: Stresses In A Soil Mass

Section: Chapter Questions

Problem 8.8P

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For a site, there is a layer of sand, 5.3m thick, that lies over a clay layer of 1.2m. The water table is 1.3m below the ground surface. The saturated unit weights of the sand and clay are 21.6 kN/m³ and 18.8 kN/m³, respectively. The unit weight of sand above the water table is 17.2 kN/m³.

Determine the total vertical stress, porewater pressure and effective vertical stress at the bottom of each layer.
Plot the values found in (a) against the depth below ground level.
If the water table rises up to an elevation of 0.7 m above the ground level, what will the total vertical stress, pore water pressure and effective vertical stress at the bottom of the clay layer?

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