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The results of a consolidated drained triaxial test on a normally consolidated clay are shown in the figure. The angle of internal friction is

1. sin⁻¹(1/2)
2. sin⁻¹(1/3)
3. sin⁻¹(2/3)
4. sin⁻¹(3/4)

Correct answer: sin⁻¹(1/3)

Solution

The angle of internal friction for normally consolidated clay can be derived from the effective stress parameters shown in the test results, where the correct value corresponds to the ratio of the effective stress components, leading to sin⁻¹(1/3) as the accurate representation.

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