Soil Mechanics and Foundation
Time factor for a clay layer is

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

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Soil Mechanics and Foundation
Within the consolidation process of a saturated clay

a gradual increase in neutral pressure and a gradual decrease in effective pressure takes place and sum of the two is constant
both neutral pressure and effective pressure increase
a gradual decrease in neutral pressure and a gradual increase in effective pressure takes place and sum of the two is constant
both neutral pressure and effective pressure decrease

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Soil Mechanics and Foundation
Degree of consolidation is

directly proportional to square of drainage path and inversely proportional to time
directly proportional to time and inversely proportional to drainage path
directly proportional to time and inversely proportional to square of drainage path
directly proportional to drainage path and inversely proportional to time

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