Soil borings made at a site indicate that the top 8 m is a loose sand, with the groundwater table at 4 m below the ground surface. Below this is a fairly soft blue-gray silty clay with an average water content of 30%. The boring was terminated at 20 m below the ground surface when fairly stiff silty clay was encountered. For the upper sand gammadry = 14.0 kN/m3 and gammasat = 15.0 kN/m3 , where gamma is the unit weight. For the clay, ps = 2.70 Mg/m3 where p is density. (1) Calculate the total stress, pore water pressure, and effective stress at 0 (the surface), 4, 8, 14, 16, and 20 m below the ground surface. (2) Plot the soil profile and the variation of total stress, pore water pressure, and effective stress with depth.
Soil borings made at a site indicate that the top 8 m is a loose sand, with the groundwater table at 4 m below the ground surface. Below this is a fairly soft blue-gray silty clay with an average water content of 30%. The boring was terminated at 20 m below the ground surface when fairly stiff silty clay was encountered. For the upper sand gammadry = 14.0 kN/m3 and gammasat = 15.0 kN/m3 , where gamma is the unit weight. For the clay, ps = 2.70 Mg/m3 where p is density.
(1) Calculate the total stress, pore water pressure, and effective stress at 0 (the surface), 4, 8, 14, 16, and 20 m below the ground surface.
(2) Plot the soil profile and the variation of total stress, pore water pressure, and effective stress with depth.
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