Soil Mechanics and Foundation
Clay layer A with single drainage and coefficient of consolidation Cv takes 6 months to achieve 50% consolidation. The time taken by clay layer B of the same thickness with double drainage and coefficient of consolidation Cv/2 to achieve the same degree of consolidation is

6 months
24 months
12 months
3 months

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Soil Mechanics and Foundation
Within the consolidation process of a saturated clay

both neutral pressure and effective pressure decrease
both neutral pressure and effective pressure increase
a gradual decrease in neutral pressure and a gradual increase in effective pressure takes place and sum of the two is constant
a gradual increase in neutral pressure and a gradual decrease in effective pressure takes place and sum of the two is constant

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Soil Mechanics and Foundation
With the increase in the amount of compaction energy

optimum water content increases but maximum dry density decreases
both optimum water content and maximum dry density increase
both optimum water content and maximum dry density decrease[ES 93]
optimum water content decreases but maximum dry density increases

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