A CU triaxial test was carried out on a silty clay that was isotropically consolidated using a cell pressure of 125 kPa. The following data were obtained:
(a) Plot the deviatoric stress against axial strain and excess pore water pressure against axial strain.
(b) Determine the undrained shear strength and the friction angle.
(c) Determine E' and E's.
(d) Determine Skempton's Af.