(Solved): A layer of saturated clay \( 4 \mathrm{~m} \) thick is overlain by sand \( 5 \mathrm{~m} \) deep, t ...

A layer of saturated clay \( 4 \mathrm{~m} \) thick is overlain by sand \( 5 \mathrm{~m} \) deep, the water table being 3 \( \mathrm{m} \) below the surface, as shown in Figure below. The saturated unit weights of the clay and sand are 19 and \( 20 \mathrm{kN} / \mathrm{m3} \), respectively; above the water table the (dry) unit weight of the sand is \( 17 \mathrm{kN} / \mathrm{m} 3 \). a. Determain the total stress and effective stress at the bottom of clay layer \( (9 \mathrm{~m} \) from the surface) b. Plot the values of total vertical stress, water pore pressure, and effective vertical stress against depth