Soil Mechanics and Foundation
Time factor for a clay layer is

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

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Soil Mechanics and Foundation
A tri-axial shear test is preferred to direct shear test, because

Precise measurement of pore pressure and change in volume during test, is not possible
It can be performed under all three drainage conditions with complete control
Stress distribution on the failure plane, is non uniform
None of these

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