Problem $2$

The stresses shown on the element below are stresses on a soil sample when it failed in a

triaxial compression test $($Lab $7).$ All stresses shown are effective stress. From your Mohr's

circle that is drawn to scale, graphically find the following:

$($a$)$ The stresses $({}^{\text{'}},)$ on the maximum obliquity plane.

$($b$)$ Orientation of this plane in stress and real spaces from the major principal plane.

$($c$)$ Stresses $({}^{\text{'}},)$ on a plane oriented at $=30$ degrees counterclockwise from the major

principal plane.