a. A vane shear test was conducted in a saturated clay. The height and diameter of the rectangular vane were 101.6 mm and 50.8 mm, respectively. During the test, the maximum torque applied was 280 N? m. 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)].

Eq. (3.40a)

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A = 1.7 – 0.54 log [PI(%)]