25: Shear strength parameters of N.C. clay sample are: Ø = 15°, 6 = 30° a- In a CU test on the same soil the confining pressure is (150) kN/m². Find the deviator stress at failure. b- In a slow direct shear test, the normal stress is 100 kN/m². Find the shear stress at failure. c- In an unconfined compression test, the unconfined shear strength (cu) is 50 kN/m². Find the pore water pressure at failure (assume ć= 0)

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Planar Stresses