For the triaxial test on the clay specimen in Problem 12.6, a. What is the inclination of

Question:

For the triaxial test on the clay specimen in Problem 12.6,
a. What is the inclination of the failure plane with the major principal plane?
b. Determine the normal and shear stress on a plane inclined at 30° with the major principal plane at failure. Also explain why the specimen did not fail along this plane.