Vane shear test is used to determine the undrained shear strength of:
Choose the correct answer
Dense sand and gravel
Soft to medium sensitive saturated clays (in-situ or lab)
Rock core samples
Unsaturated expansive soils
Correct Answer
B. Soft to medium sensitive saturated clays (in-situ or lab)
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Vane shear test (IS 2720 Part 30): used for soft to medium sensitive saturated clays in the field (or lab). A cruciform vane is pushed into soil and rotated; torque at failure = Su × (πD²H/2 + πD³/6). Very suitable for quick clays and marine clays where sampling is difficult.
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