In the Unified Soil Classification System, a fine-grained soil plotting above the A-line on the plasticity chart is generally classified as:
Correct answer: B. Inorganic clay
- A. Inorganic silt
- B. Inorganic clay
- C. Organic silt
- D. Clean sand
Explanation
The A-line separates most inorganic clays from silts on the plasticity chart. A soil above the A-line is generally clayey, while a soil below it is generally silty. Clean sand is a coarse-grained classification.
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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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