Soil Mechanics and Foundation
Quick sand is a

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

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Soil Mechanics and Foundation
Effective stress on soil

Increases both voids ratio and permeability
Decreases voids ratio and increases permeability
Increases voids ratio and decreases permeability
Decreases both voids ratio and permeability

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