1. Mohr-Coulomb shear failure criterion (20 points) In a tri-axial test (with load and confining pressure), the sample has the cohesion of 5 kPa, the angle of friction is 36 degree, It is loaded with a loading level of 50 kPa. Now we start to reduce the confining pressure. Question: what is the critical value of the confining pressure has to reach then the sample start to have shear failure

answer:

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answer:

31

explanation:

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Explanation: