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
Coefficient of compressibility is

independent of type of soil but depends on the stress history of soil
constant for any type of soil
different for different types of soils but same for a soil under different states of consolidation
different for different types of soils and also different for a soil under different states of consolidation

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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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