A consolidated-undrained triaxial test (axial compression) on a specimen of saturated over- consolidated clay was carried out under an all-round pressure of 400 kPa. Consolidation took place against a back pressure of 100 kPa. The principal stress difference at failure was (600 +) kPa. From drained tests on identical samples, it is known that q' = 22 and c' = (15+) kPa. (a) How much is the pore water pressure reading at failure in the undrained test? (10 Marks) (b) Plot the TSP, ESP and (T-uo)SP for this CU test on a p-q diagram. (8 Marks)