A clay stratum of 8 m thick lies below the sand stratum of 5 m thickness. The water table is at a depth of 2 m from the ground surface. The liquid limit of clay soil is 20% and the degree of saturation is 65%, the natural moisture content of clayey soil is 13%, bulk and the saturated unit weight of sand are 17 kN/m2 and 19 kN/m2 respectively. find the settlement (in mm) of soil when the water table falls by 2m. Take Gs = 2.65 , Yw = 10 kN/m2.
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