Soil Mechanics and Foundation
Quick sand is a

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

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Soil Mechanics and Foundation
The shear strength of a soil

Decreases with increase in normal stress
Is inversely proportional to the angle of internal friction of the soil
Decreases with decrease in normal stress
Is directly proportional to the angle of internal friction of the soil

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