A specimen of saturated sand drainage was permitted.a)Drained friction angle@'b)Draw Mohr's circle

Описание: specimen of saturated sand was consolidated under an all-around pressure of 12 lb/in*.
The axial stress was then increased and drainage was permitted. The specimen failed when the axial deviator stress reached 9.1 lb/in?. The pore water pressure at failure was 6.8 Ib/in?
Find out the followings:
a) Drained friction angle, @'
b) Draw the failure envelope and the Mohr's circle for the soil sample.
c) Angle that the failure plane makes with the major principal plane [from the Mohr's circle]
d) Major and minor principal stresses (Ib/in}) [from the Mohr's circle]
e) Normal stress and shear stress on the failure plane (Ib/in?). [from the Mohr's circle]
f) What would be the deviator stress at failure, if undrained test was conducted with the same chamber all-around pressure? Consider the pore water pressure at failure was 6.8 lb/in?

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