A 3 m thick saturated soil stratum has a compression index of 0.25 and coefficient of permeability 3.2 x 10-3 mm/sec. If the voids ratio is 1.5 at vertical stress of 0.10 N/mm2 , compute the voids ratio when the vertical stress is increased to 0.25 N/mm2 . Also calculate settlement due to above stress increase and time required for 50% consolidation. Assume single drainage

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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.