Question: Dry sand samples were tested using a direct shear test. The sand was found to have shear strength of 5 psi at a normal stress

Dry sand samples were tested using a direct shear test. The sand was found to
have shear strength of 5 psi at a normal stress of 10 psi, and shear strength of 10 psi at a normal stress
of 20 psi. Using the graphical method and Mohr Circle principles

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