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
The average coefficient of permeability of natural deposits

Parallel to stratification is always greater than that perpendicular to stratification
Is always same in both directions
Parallel to stratification may or may not be greater than that perpendicular to stratification
Parallel to stratification is always less than that perpendicular to stratification

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