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 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

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Soil Mechanics and Foundation
Quick sand is a

type of sand
flow condition occurring in cohesionless soils
flow condition occurring in both cohesive and cohesionless soils
flow condition occurring in cohesive soils

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