Q$5$:

A direct shear test was conducted on a remoulded sample of sand, gave the following

observations at the time of failure: Normal load $=288N$; shear load $=173N.$ The cross$-$sectional

area of the specimen $=36c{m}^2.$ Determine:

a$)$ The angle of internal friction,

b$)$ The magnitude and direction of the principal stresses in the zone of failure.

c$)$ The orientation of the failure plane.

d$)$ The magnitude and orientation of the plane of the maximum shear stress at failure.........................

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