A specimen of saturated sand was consolidated under an all-around pressure of 105kN/m2.The axial stress was then increased and drainage was prevented.The specimen failed when the axial deviator stress reached 70 KN/m2.The pore water pressure at failure was 50 KN/m2.Determine: i. Consolidated-undrained angle of shearing resistance, ɸ ii. Drained friction angle, ɸ′ iii. Sketch Mohr’s circles and Failure Envelops in terms of total and effective stress. iv. Assuming soil specimen to be homogenous, sketch a network of failure planes.

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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 A specimen of saturated sand was consolidated under an all-around pressure of 105kN/m2.The axial stress was then increased and drainage was prevented.The specimen failed when the axial deviator stress reached 70 KN/m2.The pore water pressure at failure was 50 KN/m2.Determine:
i. Consolidated-undrained angle of shearing resistance, ɸ
ii. Drained friction angle, ɸ′
iii. Sketch Mohr’s circles and Failure Envelops in terms of total and effective stress.
iv. Assuming soil specimen to be homogenous, sketch a network of failure planes.

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