Soil Mechanics and Foundation
Coefficient of consolidation for clays normally

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

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

None of these
Precise measurement of pore pressure and change in volume during test, is not possible
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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Soil Mechanics and Foundation
With the increase in the amount of compaction energy

optimum water content increases but maximum dry density decreases
optimum water content decreases but maximum dry density increases
both optimum water content and maximum dry density increase
both optimum water content and maximum dry density decrease[ES 93]

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Soil Mechanics and Foundation
The effect of cohesion on a soil is to

reduce both the active earth pressure intensity and passive earth pressure intensity
reduce the active earth pressure in-tensity but to increase the passive earth pressure intensity
increase the active earth pressure in-tensity but to reduce the passive earth pressure intensity [GATE 99]
increase both the active earth pressure intensity and passive earth pressure intensity

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