Soil Mechanics and Foundation
Coefficient of consolidation for clays normally

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

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

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

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
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 decrease

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Soil Mechanics and Foundation
The shear strength of a soil

Decreases with decrease in normal stress
Is inversely proportional to the angle of internal friction of the soil
Decreases with increase in normal stress
Is directly proportional to the angle of internal friction of the soil

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