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The unconfined compression test is generally applicable to ____________

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in Geotechnical Engineering I by (102k points)
The unconfined compression test is generally applicable to ____________

(a) Unsaturated clay

(b) Saturated clay

(c) Fine grained soil

(d) Coarse grained soil

I got this question in my homework.

My question is from Unconfined Compression Test in section Shear Strength of Geotechnical Engineering I

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Correct option is (b) Saturated clay

Explanation: In the equation σ1=2cu tan (45° + φu/2), for determining major principal stress, there are 2 unknowns cu and φu which cannot be determined by unconfined test. Therefore, the unconfined compression test is generally applicable to saturated clays for which the apparent angle of shearing resistance φu is zero.

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