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What is the angle of internal friction for a saturated soil sample that fails under axial stress of 100 kN/m2 in an unconfined compression test and the failure plane makes an angle of 50° with the horizontal?

What is the angle of internal friction for a saturated soil sample that fails under axial stress of 100 kN/m2 in an unconfined compression test and the failure plane makes an angle of 50° with the horizontal? Correct Answer 10°

The angle of internal friction, Φ is related to the failure angle, θ by the equatioΦ=2θ-90 Substituting θ=50° from the question, Φ=2×50°-90=10°

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