Soil Mechanics and Foundation
When the degree of saturation is zero, the soil mass under consideration represents

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

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

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