A series of drained direct shear tests were performed on a saturated clay. The results, when plotted on a Mohr diagram, gave c' = 10 kPa and tan ɸ' = 0.5. Another specimen of this clay was consolidated to an effective pressure of 100 kPa. An undrained direct shear test was performed, and the measured value of Tff was 60 kPa. What was the pore water pressure at failure? Was the specimen normally consolidated? Why?
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