Soil Mechanics and Foundation
Terzaghi’s theory of one dimensional consolidation assumes

Soil is homogeneous and fully saturated
Deformation of the soil, is entirely due to change in volume
Water and soil particles are incompressible
All listed here

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Soil Mechanics and Foundation
Coefficient of compressibility is

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 but same for a soil under different states of consolidation
different for different types of soils and also different for a soil under different states of consolidation

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