Soil Mechanics and Foundation
Time factor for a clay layer is

a dimensional parameter
inversely proportional to drainage path
independent of thickness of clay layer
directly proportional to permeability of soil

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

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

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