A storage silo is supported on a circular foundation which has a diameter of 20 feet. The total vertical load is 300,000 lbs. Determine the vertical stress increase at a depth of 15 feet under the center of the foundation.

The following results were obtained from CU tests on a clay soil that is the foundation material for an embankment. 03 (kPa) 300 400 600 0₁-03 (kPa) 331 420 487 Au (kPa) 111 160 322 (a) Determine the total and effective principal stresses for all three tests (You may summarize them in a table). (b) Recommend the shear strength parameters to be used for short-term and long-term analyses. The maximum confining pressure (cell pressure) at the depth of interest is 300 kPa. (Note: the clay is a normally consolidated one).

Answer 4 then use the answer from 4 to answer 5

A compressible, normally consolidated clay layer is 7 ft thick and the slope of its field consolidation line is 0.27. If the initial void ratio is 0.09 and the effective overburden pressure is 2.7 tons/ft^2, what is the primary consolidation at midheight of the clay layer if the additional pressure from the building is 2.6 tons/ft^2? Give an answer in inches to 3 decimal places. Type your answer...