The following are the results of four direct shear tests on undisturbed sand samples having a diameter of 50 mm and height of 25 mm. a) Draw a graph for the shear stress at failure against the normal stress and determined the angle of friction from the graph. The friction angle is -- DEG = --- Test no. 1 2 3 4 Normal force (N) 250 375 450 540 Shear force at failure (N) 139 209 250 300

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Test for Determination of Shear Strength

The term shear strength is often associated with the soil. Shear strength is defined as the resistance to the deformation of soil particles due to the continuous action of shear stress. In short, shear strength is the maximum shear stress that a soil can sustain.