Question Bank • QB_SWCE_EXP_076 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Soil Mechanics

Subtopic: Permeability and seepage analysis

Question Statement:

A sand layer has specific gravity $G = 2.65$ and void ratio $e = 0.65$. Calculate the critical hydraulic gradient ($i_{cr} = \frac{G - 1}{1 + e}$) at which quicksand condition occurs.

Answer Key:

1

Step-by-Step Solution & Explanation

$i_{cr} = \frac{G - 1}{1 + e} = \frac{2.65 - 1}{1 + 0.65} = \frac{1.65}{1.65} = 1.0$
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