A cylindrical soil sample was subjected to axial principal effective stresses (σ1’) and radial principal effective stresses (σ3’). The soil could not support additional stresses when σ1’= 300 kPa and σ3’= 100 kPa. (1) Determine the friction angle and the inclination of the slip plane to the horizontal. (2) Determine the stresses on the failure plane. (3) Determine the maximum shear stress.

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Planar Stresses