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

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

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Soil Mechanics and Foundation
Within the consolidation process of a saturated clay

a gradual decrease in neutral pressure and a gradual increase in effective pressure takes place and sum of the two is constant
both neutral pressure and effective pressure increase
both neutral pressure and effective pressure decrease
a gradual increase in neutral pressure and a gradual decrease in effective pressure takes place and sum of the two is constant

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