Which of the following statements (s) are incorrect?
i. Consolidate undrained test on sand can be conducted easily in direct shear machine
ii. The Mohr's circle for unconfined compression test passes through the origin
iii. The effective stress failure envelope of a normally consolidated clay passes through origin
Statement (i): Incorrect
A consolidated undrained (CU) test cannot be easily performed using a conventional direct shear apparatus because drainage conditions cannot be controlled adequately during shearing. The Triaxial Shear Test is preferred for conducting consolidated undrained tests.
Statement (ii): Correct
In an Unconfined Compression Test (UCC), the minor principal stress is zero
The centre and radius of Mohr's circle are:
Since the centre and radius are equal, Mohr's circle passes through the origin
Statement (iii): Correct
For normally consolidated clay, the effective cohesion intercept is approximately zero.
Therefore, the effective stress failure envelope passes through the origin.
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