Soil Mechanics and Foundation
Time factor for a clay layer is

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

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Soil Mechanics and Foundation
Effective stress on soil

Decreases voids ratio and increases permeability
Increases voids ratio and decreases permeability
Increases both voids ratio and permeability
Decreases both voids ratio and permeability

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