Estimate the average peak friction angle

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Reference no: EM13947803

1. 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 l [Eq. (3.40a)].

2. Refer to Problem 3.17. Determine the overconsolidation ratio for the clay. Use Eqs. (3.42) and (3.45). Use s90 5 1340 lb/ft2.

3. In a deposit of normally consolidated dry sand, a cone penetration test was conducted. Following are the results:

Depth (m)	Point resistance of cone, qc (MN/m2)
1.5	2.06
3.0	4.23
4.5	6.01
6.0	8.18
7.5	9.97
9.0	12.42

Assuming the dry unit weight of sand to be 16 kN/m3, estimate the average peak friction angle, f 9, of the sand. Use Eq. (3.53).

Reference no: EM13947803

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