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A square footing 3 m x 3 m carries a column load of 3500 KN resting on the sand layer as shown on the figure. Unit weight of sand above the water table is 17.31 kN/m3 and has a saturated unit weight of 18.10KN/m3 below the water table. The sand overlies a clay layer 1.2m thick having a saturated unit weight of 16.50kN/m3 and a void ratio of 1.70. Compression index: Cs = 0.07 due to pre-consolidation pressure and Cc= 0.35 primary compression index.
assume a vertical stress distribution of 2 vertical to 1 horizontal.
Calculate the settlement due to consolidation of the layer which is over consolidated



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