An oil tank (10 m in diameter) is to be constructed on a 10-

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An oil tank (10 m in diameter) is to be constructed on a 10-m-thick layer of soft, normally consolidated clay classified

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An oil tank (10 m in diameter) is to be constructed on a 10-m-thick layer of soft, normally consolidated clay classified as CH. Its saturated unit weight is 18.8 kN/m3 and the lateral earth pressure coefficient at rest is Ko 5 0.5. Groundwater is at the surface. The clay is underlain by a sand classified as SP. The estimated settlement of the tank is intolerable. The geotechnical engineer proposes to preload the soft clay by constructing the tank and then filling it with water in stages. The dead load of the tank and its foundation will impose a uniform vertical stress of 25 kPa at the ground surface. The water level in the tank for the fi rst stage of loading is 2 m. For a soil element at a depth of 5 m under the center of the tank: (a) Calculate the initial mean total and effective stresses and the initial deviatoric stresses. Create a graph with the x-axis as p, p9 and the y-axis as q. Plot the initial stress state. (b) Calculate the total vertical stress applied at the ground surface when the tank is fi lled with 2 m of water. (c) Calculate the increase in vertical and lateral stresses on the soil element due to the total applied surface stress when the tank is filled with 2 m of water. (d) Calculate the increase in mean total stress and deviatoric stress due to the total applied surface stress when the tank is fi lled with 2 m of water. (e) Plot the total stress path when the tank is filled with 2 m of water. Clearly label this stress path. (f) If the soft clay were to behave as an isotropic, elastic material, plot the effective stress path and calculate the increase in porewater pressure.

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