A shear test was conducted on a soil sample. At failure the ratio of σ1−σ32toσ1+σ32 is equal to unit. Which one of the following shear tests represents this condition?
A
Drained triaxial compression test
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B
Undrained triaxial compression test
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C
Undrained triaxial compression test
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D
Unconfined compression test
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Solution
The correct option is D Unconfined compression test Whenratioofσ1−σ32toσ1+σ32isequaltounityσ1−σ32=σ1+σ32
σ3=0 (Confining pressure zero)
This case is represented by unconfined compression test.