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

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

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Soil Mechanics and Foundation
Coefficient of compressibility is

different for different types of soils but same for a soil under different states of consolidation
constant for any type of soil
independent of type of soil but depends on the stress history of soil
different for different types of soils and also different for a soil under different states of consolidation

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