Question

Assertion (A): Shear strength parameters of sand can be estimated by conducting unconfined compression test.
Reason (R): The effective angle of shearing resistance of sand is nearly the same for dry and saturated sands, in drained condition.

• A. both A and R are true and R is the correct explanation of A
• B. both A and R are true but R is not a correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Answer 1

The correct option is D A is false but R is true

Unconfined compression test is a special case of triaxial test carried out at zero cell pressure. This test is applicable only to soils for which ${\varphi }_U=0$ i.e. fully saturated, non-fissured clays.