Question 3: A soil profile consists of 6 m of coarse sand overlying 4 m of firm clay. The water table is at a depth of 2 m , and pore water pressures are hydrostatic over depth. The sand is estimated to have an average dry unit weight of
18k(N)/(m^(3))
over its full thickness, and to be saturated below the water table and essentially dry above the water table. The clay has an average water content of
50%
. The specific gravity of solids can be taken as 2.65 for both soils. Estimate the total vertical stress, pore water pressure, and effective vertical stress at a depth of 10 m .