The ground conditions at a site are as shown in the figure. The water table at the site which was initially at a depth of 5 m below the ground level got permanently lowered to a depth of 15 m below the ground level due to pumping of water over a few years. Assume the following data i. unit weight of water = 10 kN/m3 ii. unit weight of sand above water table = 8 kN/m3 iii. unit weight of sand and clay below the water table = 20 kN/m3 iv. coefficient of volume compressibility = 0.25 m2/MN
What is the change in the effective stress in kN/m2 at mid-depth of the clay layer due to the lowering of the water table?
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