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
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

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Soil Mechanics and Foundation
Quick sand is a

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

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