Homeworks of chapter 5 1. Figure below shows the soil proile at a site for a proposed building. The soil is a homogeneous, poorly graded sand. Determine the increase in vertical effective stress at which a soil element at a depth of 3 m, under the center of the building, will fail if the increase in lateral effective stress is 20% of the increase in vertical effective stress. The coefi- cient of lateral earth nrescure at rest K. is 0 5. Assume all

a. A vane shear test was conducted in a saturated clay. The height and diameter of the rectangular vane were 4 in. and 2 in., respectively. During the test, the maximum torque applied was 230 lb-in. Determine the undrained shear strength of the clay. b. The clay soil described in part (a) has a liquid limit of 58 and a plastic limit of 29. What would be the corrected undrained shear strength of the clay for design purposes? Use Bjerrum’s relationship for λ

Determine the effective stress increase, rate of increase of effective stress  in the soil at depth of 4 meters below the footing. The water table is 5 meter below the footing. Soil below has the following properties in laboratory: wet mass=44g, dry mass=30.1g, wet volume=24.6cc, dry volume=15.9cc, SR=1.893, void ratio=1.3 (assume soil above WT is dry)

ASAP PLS