Soil Mechanics and Foundation
Time factor for a clay layer is

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

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

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

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