(Solved): A typical Mohr circle at failure for a soft clay specimen tested in triaxial compression is shown be ...

A typical Mohr circle at failure for a soft clay specimen tested in triaxial compression is shown below. The specimen was normally consolidated to an effective confining stress of 100kPa prior to shearing.

a. Assuming \( \mathrm{c}^{\prime}=0 \mathrm{kPa} \), sketch the Mohr-Coulomb failure envelope. What is the effective-stress friction angle, \( \phi^{\prime} \) ? b. Sketch the Mohr circle at failure for a normally consolidated specimen of the same clay, consolidated to an effective stress of \( 50 \mathrm{kPa} \). c. Sketch the Mohr circle at failure for a normally consolidated specimen of the same clay, consolidated to an effective stress of \( 200 \mathrm{kPa} \).