In a unconfined compression test on a cohesive clay soil sample, the unconfined compressive strength (qu) is related to undrained cohesion (cu) by:
Acu = qu / 2
Bcu = qu
Ccu = 2 * qu
Dcu = qu / 5.7
Explanation
In unconfined compression test (sigma3 = 0), major principal stress sigma1 = qu. Cohesion cu = q_u / 2 for saturated clay (phi = 0).

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