A field vane shear test is primarily used to determine the undrained shear strength of:
Correct answer: A. Soft saturated clay
- A. Soft saturated clay
- B. Dense gravel deposits
- C. Clean coarse sand
- D. Sound weathered rock
Explanation
The field vane test directly measures the undrained shear strength of soft, saturated cohesive soil. It is not suitable for gravel or clean sand because the vane cannot produce a reliable cylindrical failure surface in those materials.
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About Soil Mechanics and Foundations
Soil mechanics examines index properties, phase relationships, classification, permeability, seepage, compaction, consolidation, shear strength and earth pressure. Foundations apply these principles to bearing capacity, settlement and shallow or deep foundation selection, with clear distinction between compaction, which expels air, and consolidation, which expels water over time.
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