GATE Exam Questions

Q1: A direct shear test was conducted on a cohesionless 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

A 26.6

B 29.5

C 30.0

D 32.6

ANS:A - 26.6

Shear stress = C + normal stress*tan (theta).

Here given C=0, shear stress = 100 and normal stress = 200.
After putting all these values in above formula we will get.

"theta= 26.56".



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