The figure shows the soil profile at a site where you plan to lower the water table. You have results from two consolidation tests, one from the upper 12 ft thick over-consolidated crust, and another from the lower 32 ft thick normally consolidated zone. You plan to lower the water table from its current 12 ft depth to 20 ft below ground surface. The consolidation properties for each layer are shown. Assume that the soft clay in the lower layer remains saturated because of full capillarity. Assume that the lower clay is normally consolidated. Note that the notation Cce means Ce/ (1 + eo), etc. (a) Compute O'y the in the middle of each layer before and after the water table is lowered. (b) Determine the total settlement that will result from lowering the water table. Stiff clay, Yt = 120 pcf Cre = 0.029, Co = 0.178, o, = 1650 psf 12 20 Soft clay, Y = 118 pcf Cr. = 0.034, C = 0.185 %3D 44 Depth (ft)

Q: The figure shows the soil profile at a site where you plan to lower the water table. You have…

A:

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Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.