A sample of silty fine sand was taken to the laboratory and tested in the shear box apparatus. During the testing, the shear load and the horizontal displacement, 8h were

recorded for various normal loads. For each normal load, the shear load was plotted for õh. The maximum shear load at failure was determined for each normal load as follows: The size of the sample was 60 x 60mm in plan. Plot the maximum Shear Stress v Normal Stress and thus determine the cohesion and the angle of friction for the sample