The effective stresses at failure for three identical triaxial specimens of an over-consolidated clay are shown in Fig. P13.49. Plot the Mohr circles at failure and determine ∅' and c'. Determine the theoretical angle of inclination of the failure planes in each test specimen, and show these on a small sketch. Also sketch the effective stress paths for the three tests. (After C.W. Lovell.)?

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| 1230 kPa |100 kPa | 460 kPa A 450 kPa 2350 kPa (AC) FIGURE P13.49 (LC) (LE)