A CD triaxial test was conducted on a granular soil. At failure σ‘1σ‘3 was 3.0. The effective minor principal stress of failure was 75kPa. The principal stress difference at failure will be
A
75kPa
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B
150kPa
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C
225kPa
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D
300kPa
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Solution
The correct option is B150kPa σ‘3=75kPa;σ‘1=3σ‘3
Principal stress difference =σ‘1−σ‘3=2σ‘3=2×75 =150kPa