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

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

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Soil Mechanics and Foundation
Coefficient of compressibility is

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

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