The following results were obtained from direct shear tests on specimen of sand compacted to the in-situ density Determine the value of shear strength parameters Normal stress (kPa) Shear stress at failure (KPa) 30 50 20 120 180 30 75 110 Angle of friction (deg) Cohesion (KPa) Would failure occur on a plane with a mass of this sand at a point where the shear stress is 80 kPa and normal stress of 150 kPa

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