A piezocone test was carried out at a site, and the following readings were recorded for the cone resistance qc and sleeve friction fs. Determine the soil present at these depths. Depth (m) 5 10 15 20 22 Cone resistance, qc (MN/m2) 0.21 1.05 3.23 9.66 10 Sleeve friction, fs (kN/m2) 12.5 40.5 75.2 60.7 80

For a soil, the effective angle of internal friction Q was found to be 14° and the cohesion component c' was 46 kPa. The soil was tested in con- solidated drained triaxial condition when the failure stress (o, – 6,) was found to be 132 kPa. What was the confining pressure o, for this test?

a. A vane shear test was conducted in a saturated clay. Theheight and diameter of the rectangular vane were 4 in.and 2 in., respectively. During the test, the maximumtorque applied was 230 lb ? in. Determine the undrainedshear strength of the clay.b. The clay soil described in part (a) has a liquid limit of58 and a plastic limit of 29. What would be the correctedundrained shear strength of the clay for design purposes?Use Bjerrum’s relationship for l [Eq. (3.40a)].  Determine the overconsolidation ratiofor the clay. Use Eqs. (3.42) and (3.45). Use s9o 5 1340 lb/ft2.