A Triaxial Sample Of Loose Sand Is Tested In Lateral

A triaxial sample of loose sand is tested in lateral extension (LE) (see Fig. 13.7). The sample is first consolidated non-hydrostatically, with σ1 = 15 kPa and σ3 = 10 kPa. The sample is then failed in LE, and the angle of internal friction is 30°, c = 0.
(a) Draw the Mohr circles for both initial and “at failure” conditions.
(b) What will be the major and minor principal stresses at failure?

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