Question

The soil profile at the bottom of a 10-ft deep lake consists of 3 feet of high plasticity clay (γsat= 118 pcf) above 12 feet of silty sand (γsat= 124 pcf). Below the silty sand is a 20-ft-thick layer of poorly graded sand(γsat= 123 pcf). During a drought, the lake depth reduces to only 5 feet. Calculate the change in total stress, effective stress, and pore water pressure at the center of the SP layer due to drought conditions.

Answer 1