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Mohr Coulomb Failure Criterion-II

In an unconfi...

Question

In an unconfined compression test on a saturated clay, the undrained shear strength was found to be $6 t / m^{2}$ . If a sample of the same soil is tested in an undrained condition in triaxial compression at a cell pressure of $20 t / m^{2}$ , then the major principal stress at failure will be

A

48 t / m^{2}

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B

32 t / m^{2}

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C

24 t / m^{2}

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D

12 t / m^{2}

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Solution

The correct option is B $32 t / m^{2}$
Major principal stress in undrained test
$=$ cell pressure $+$ undrained shear stength $\times 2$
$= 20 + 6 \times 2 = 32 t / m^{2}$

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