In a direct shear test on a specimen of cohesionless sand, the vertical normal stress on the specimen is 260 kN/m2 and the horizontal shear stress at failure is 130 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.

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Test for Determination of Shear Strength

The term shear strength is often associated with the soil. Shear strength is defined as the resistance to the deformation of soil particles due to the continuous action of shear stress. In short, shear strength is the maximum shear stress that a soil can sustain.