Soil Mechanics and Foundation
A fully saturated soil is said to be

two phase system with soil and air
two phase system with soil and water
one phase system
three phase system

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Soil Mechanics and Foundation
In a deposit of normally consolidated clay

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

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