Question: Two conventional CD triaxial compression tests were conducted on a dense angular dry sand at the same void ratio. Test A had a confining pressure

Two conventional CD triaxial compression tests were conducted on a dense angular dry sand at the same void ratio. Test A had a confining pressure of 150 kPa, while in test B the confining pressure was 600 kPa; these stresses were held constant throughout the test. At failure, tests A and B had maximum principal stress differences of 600 and 2550 kPa, respectively.

(a) Plot the Mohr circles for both tests at initial conditions and at failure..

(b) Assuming c = 0, determine ψ.

(d) Determine the theoretical orientation of the failure plane in each specimen.

(e) What is the orientation of the plane of maximum obliquity?

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a Solve using Mohrs circle and the pole method see plot Test A 1 750 3 150 xy 0 c... View full answer

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