Introduction to consolidation settlements

Reference no: EM1382552

A spread footing is designed to have dimensions 15 ft by 15 ft and will carry a load of 225 kips. The reinforced concrete (γ=150 pcf) footing is 2.5 ft thick. The footing will be placed at the surface of a clay deposit that is 28 ft thick. The groundwater table is located 5 ft below the ground surface, but the clay is saturated to the surface due to capillarity. The clay layer is underlain by very dense sand. The clay has a total unit weight of 118 pcf, an initial void ratio of 0.91, a compression index of 1.0, a recompression index of 0.2, a coefficient of consolidation of 0.18 ft^2/day, an OCR of 3.0 and a modulus of elasticity (E) of 1.2 x 106 psf. Estimate the total settlement at the corner of the footing caused by the load and the weight of the footing. Include immediate and consolidation settlements, but ignore secondary compression. In your calculation, use three sublayers with thicknesses of 4 ft, 8 ft and 16 ft for the top, middle and bottom layers. Ignore any settlement caused by the dense sand layer.

Reference no: EM1382552

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