$)$ If a $CD$ test is performed on a similar specimen under confining stress $({}_3)$ o

$300$kPa, calculate the deviatoric stress $({}_d)f$ at failure.

c$)$ If a direct shear test is performed on a specimen of this soil under normal

stress of $300$kPa in drained condition, what will be the shear stress at failure?

Two CD triaxial tests were performed on specimens of OC clay. The following results were obtained:

a$)$ Draw the effective stress Mohr circles at failure and the failure envelope.

Determine the cohesion, $c^{\text{'}},$ and friction angle, ${}^{\text{'}}.($Note: $c^{\text{'}}0,{}^{\text{'}}0)$

Answer question a$)$ b$)$ c$)$ d$)$ because it belongs to the same question