A direct shear test was run a cylindrical sample of sands using a vertical force of 160N. The sample had a diameter of 51mm. Determine: a) If the maximum horizontal force was 1065N, what was the peak friction angle? b) If this material is tested using a triaxial apparatus, what will be the major principle stress σ1 ’ at failure, under the minor principle stress of σ3 ’ = 120 kPa?
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