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Which one of ...

Question

Which one of the following conditions is valid in case of unconfined compression test in comparison to triaxial test?

A

Minor principal stress = 0

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B

Minor principal stress = 0.5 x major principal stress

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C

Minor principal stress = major principal stress

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D

Major principal stress = 3 x minor principal stress

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Solution

The correct option is A Minor principal stress = 0
Unconfined compression test is a special case of triaxial test in which the confining pressure is zero. This test may be conducted on undisturbed or remoulded cohesive soils. It cannot be conducted on coarse-grained soils such as sands and gravels as these cannot stand without lateral support.

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