In soil classification, the effective grain size D10 represents the particle size corresponding to:
Correct answer: C. 10 percent finer by weight
- A. 50 percent finer by weight
- B. 10 percent coarser by weight
- C. 10 percent finer by weight
- D. 90 percent finer by weight
Explanation
D10 is read from the particle-size distribution curve at 10 percent finer. It is also called the effective size and is commonly used in permeability-related correlations.
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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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