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Mohr Coulomb Failure Criterion-III

A CD triaxial...

Question

A $C D$ triaxial test was conducted on a granular soil. At failure $\frac{σ ‘_{1}}{σ ‘_{3}}$ was $3.0$ . The effective minor principal stress of failure was $75 k P a$ . The principal stress difference at failure will be

A

75 k P a

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B

150 k P a

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C

225 k P a

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D

300 k P a

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Solution

The correct option is B $150 k P a$
$σ ‘_{3} = 75 k P a; σ ‘_{1} = 3 σ ‘_{3}$
Principal stress difference
$= σ ‘_{1} - σ ‘_{3} = 2 σ ‘_{3} = 2 \times 75$
$= 150 k P a$

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