(CE APRIL 2024) a layer of clay 10 m thick is overlain by a 15.2 m thick to ground surface. When the water table is at ground surface level, the saturated unit weight of the sand was determined to be 21.2 kN/m3 for which its dry unit weight is 18.2 kN/m3 . the saturated unit weight of the clay is 18.8 kN/m3 . When the ground water table lowered by 7.6 m, the degree of saturation of the sand above the water table was lowered to 30 %. At the mid-height of the clay.
a. Evaluate the effective pressure, in kPa, before lowering of the water table
b. Evaluate the effective pressure, in kPa, after lowering of the water table
c. Evaluate the effective pressure, in kPa, when there is no water in the sand layer
but remain in moist condition at the same degree of saturation
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