The subsoil strata at a site consist of fine sand 3.0 m thick overlying a stratum of clay 2.8 m thick. Under the clay stratum lies a deposit of coarse sand extending to a considerable depth. The water table is 2.8 m below the ground surface. Assuming the top fine sand to be saturated by capillary water, calculate the effective pressures at ground surface and at depths of 3.0 m, 5.8 m and 8.0 m below the ground surface. Assume for fine sand G = 2.65, e = 0.83 and for coarse sand G = 2.79, e = 0.53. What will be the change in effective pressure at depth 3.74 m, if no capillary water is assumed to be present in the fine sand and its bulk unit weight is assumed to be 16.88 kN/m3 . The unit weight of clay may be assumed as 19.75 kN/m3. Comment on the effect of the present of groundwater on design of earth structures?
The subsoil strata at a site consist of fine sand 3.0 m thick overlying a stratum of clay 2.8 m thick. Under the clay stratum lies a deposit of coarse sand extending to a considerable depth. The water table is 2.8 m below the ground surface. Assuming the top fine sand to be saturated by capillary water, calculate the effective pressures at ground surface and at depths of 3.0 m, 5.8 m and 8.0 m below the ground surface. Assume for fine sand G = 2.65, e = 0.83 and for coarse sand G = 2.79, e = 0.53. What will be the change in effective pressure at depth 3.74 m, if no capillary water is assumed to be present in the fine sand and its bulk unit weight is assumed to be 16.88 kN/m3 . The unit weight of clay may be assumed as 19.75 kN/m3. Comment on the effect of the present of groundwater on design of earth structures?
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