At a planned construction site, a 2 m. thick stratum of normally consolidated clay underlies a surface layer of compact granular soil 3 m. deep. The unit weight for the compact granular soil is 20.2 kN/m3. The clay material has a unit weight of 17.6 kN/m3. The groundwater table is 3 m. from the ground. Laboratory testing of the clay indicates an in-place void ratio of 1.35 and a compression index of 0.42. The building planned for the site will create a stress increase of 24.5 kN/m2 at the center of the clay layer. a) Determine the primary settlement due to stress increase. b) Calculate the primary settlement to be expected if the groundwater table were at the soil surface. Assume that the saturated unit weight is 24 kN/m3. c) Determine the primary settlement occurring in the clay layer if the clay is overconsolidated, Cs = 0.09 and the preconsolidated pressure is 120 kPa.
At a planned construction site, a 2 m. thick stratum of normally consolidated clay underlies a surface layer of compact granular soil 3 m. deep. The unit weight for the compact granular soil is 20.2 kN/m3. The clay material has a unit weight of 17.6 kN/m3. The groundwater table is 3 m. from the ground. Laboratory testing of the clay indicates an in-place void ratio of 1.35 and a compression index of 0.42. The
a) Determine the primary settlement due to stress increase.
b) Calculate the primary settlement to be expected if the groundwater table were at the soil surface. Assume that the saturated unit weight is 24 kN/m3.
c) Determine the primary settlement occurring in the clay layer if the clay is overconsolidated, Cs = 0.09 and the preconsolidated pressure is 120 kPa.
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