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Triaxial Test-III

A soil sample...

Question

A soil sample tested in a triaxial compression apparatus failed when the total maximum and minimum principal-stresses were 100 kPa and 40 kPa, respectively. The pore pressure measured at failure was 10 kPa. The effective principal stress ratio at failure is

A

2.5

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B

3.0

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C

2.75

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D

2.0

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Solution

The correct option is B 3.0
Effective principal stress ratio
$= \frac{σ_{1} - u}{σ_{3} - u} = \frac{100 - 10}{40 - 10} = 3.0$

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