Soil Mechanics and Foundation
In a deposit of normally consolidated clay

effective stress and water content increase with depth but undrained strength decreases with depth
effective stress, water content and undrained strength decrease with depth
effective stress and undrained strength increase with depth but water content decreases with depth
effective stress increases with depth but water content of soil and un-drained strength decrease with depth

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

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