The relationship between the specific gravity of sand (G) and the hydraulic gradient (i) to initiate quick condition in the sand layer having porosity of 30% is

G = 0.7i + 1
G = 1.43i - 1
G = 1.43i + 1
G = 0.7i - 1

Correct answer: G = 1.43i + 1

Solution

The correct option establishes a linear relationship between specific gravity and hydraulic gradient, reflecting how an increase in hydraulic gradient influences the specific gravity needed to initiate quick conditions in sand with a given porosity.

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