Soil Mechanics and Foundation
Time factor for a clay layer is

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

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Soil Mechanics and Foundation
Coefficient of earth pressure at rest is

greater than active earth pressure but less than passive earth pressure
less than active earth pressure but greater than passive earth pressure
greater than both the active earth pressure and passive earth pressure
less than both the active and passive earth pressures

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