Soil Mechanics and Foundation
Coefficient of consolidation for clays normally

first increases and then decreases with increase in liquid limit
remains constant at all liquid limits
decreases with increase in liquid limit
increases with increase in liquid limit

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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
None of these
Stress distribution on the failure plane, is non uniform
It can be performed under all three drainage conditions with complete control

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