In the context of shear strength of soil, which of the following statements is/are CORRECT?

The unconfined compression test is a special case of the unconsolidated-undrained (UU) triaxial tests.
The shear strength parameters obtained from the consolidated-drained (CD) triaxial tests should be used to analyse rapid construction in clay.
Vane shear test is commonly used for determining in situ undrained strength of saturated clay soils.
In an unconsolidated-undrained (UU) triaxial tests, the angle of internal friction (ϕ) is equal to zero.

Correct answer: Vane shear test is commonly used for determining in situ undrained strength of saturated clay soils.

Solution

The vane shear test is specifically designed to measure the undrained shear strength of saturated clay in situ, making it a reliable method for assessing the strength of soft clays under undrained conditions.

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