A direct shear test is run on a dense silty sand with a normal stress = 12 ksf. Take coefficient of earth pressure at rest, Ko = 0.5. At failure, the normal stress = 12 ksf and the shear stress is 10 ksf. Draw the Mohr circles for the initial and at failure and determine:
a) the principal stresses at failure
b) the orientation of the failure plane
c) the orientation of the major and minor principal planes at failure
d) the orientation of the plane that the maximum shear stress acts upon.
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