A flexible steel platform has a footprint of 75 feet by 75 feet and supports equipment having a total weight of 2,250 kips. The platform is located at the ground surface. The soil profile below the platform consists of 30 feet of stiff clay over bedrock. The groundwater table is located 5 feet below the ground surface. The clay has a unit weight of 120 pcf above the water table and 125 pcf below the water table. Laboratory consolidation test results for a sample of the clay at a depth of 15 feet below the ground surface reveal a preconsolidation stress of 2,400 psf, compression index of 0.5, recompression index of 0.1 and initial void ratio of 0.66. Assume the bedrock is incompressible. Part A Plot effective vertical stress versus depth (to scale) before and after installation of steel platform and equipment. Part B Calculate the primary consolidation settlement at the center of the platform and at the corner of the platform AND report the differential settlement between these two points. Do not subdivide the clay layer.

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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.