Multiple choice

A direct shear test was conducted on a cohesion-less soil (c = 0) specimen under a normal stress of 200 kN/m2. The specimen failed at a shear stress of 100 kN/m2. The angle of internal friction of the soil (degrees) is

  1. 26.6

  2. 29.5

  3. 30.0

  4. 32.6

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A Correct answer
Explanation