Soil Mechanics and Foundation
With the increase in the amount of compaction energy

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

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Soil Mechanics and Foundation
Effective stress on soil

Decreases voids ratio and increases permeability
Decreases both voids ratio and permeability
Increases both voids ratio and permeability
Increases voids ratio and decreases permeability

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Soil Mechanics and Foundation
For a loose sand sample and a dense sand sample consolidated to the same effective stress

ultimate strength is same but peak
ultimate strength is different but peak strength is same
ultimate strength is same and also peak strength is same
ultimate strength is same but peak strength of dense sand is greater than that of loose sand

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