Three identical specimens (same e, w) of a clay are normally consolidated and sheared consolidated-drained (CD) in both compression and extension. The stresses at failure for the three specimens are as shown in Fig. P13.50

(a) Plot the Mohr circles at failure, and determine ∅' and ∅T

(b) Determine the inclination of the predicted failure planes (from the Mohr failure hypothesis). Sketch the failed specimens, showing their failure planes.

(c) Sketch the three stress paths. (After C.W. Lovell.)?

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|6.6 45.8 -11.3 3.5 L8.3 J.4. 14.7 7.6 4.7 7.6 10.8 8.3 18.4 C (AE) A (AC) B (LC)