For a soil mass, the degree of saturation is 60 percent and the void ratio is 0.80. What fraction of the void volume is occupied by air?
Correct answer: B. 40 percent
- A. 20 percent
- B. 40 percent
- C. 60 percent
- D. 80 percent
Explanation
Degree of saturation is the fraction of void space filled with water. Therefore, the air-filled fraction is 1 minus 0.60, or 40 percent. The remaining void space contains air.
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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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