A direct shear test was performed on a 7.5 x 7.5 cm sample of dry sand. It was found that the normal and s es at failure were 560N and 280N respectively. Plot the Mohr strength envelope and determine the angl -rnal friction. Also calculate the magnitude and direction of the principle 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.