e )u and the maximum shear stress Jmax at failure.

A consolidated-drained triaxial test was conducted on a normally consolidated silty clay sample. The sample failed at F1=240 kPa and F3=120 kPa. With the assumption that c=0, determine the drained friction angle N, and the consolidated- undrained friction angle Ncu. Assume that the Skempton pore water pressure parameter A=0.75. Also, for the CU test with F3=300 kPa determine F1, F1′, F3′, excess pore water pressure )u and the maximum shear stress Jmax at failure.