In a direct shear test on a specimen of cohesionless sand, the vertical normal stress on the

Question:

In a direct shear test on a specimen of cohesionless sand, the vertical normal stress on the specimen is 240 kN/m= and the horizontal shear stress at failure is 160 kN/m2.

Assuming uniform stress distribution within the failure zone and a straight line failure envelope which goes through the origin, determine by means of the Mohr circle the magnitude and direction of the principal stresses at failure.

Distribution
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