Question

For a saturated sand deposit, the void ratio and the specific gravity of solids are 0.70 and 2.67 respectively. The critical (upward) hydraulic gradient for the deposit would be

• A. 0.54
• B. 0.98
• C. 1.02
• D. 1.87

Answer 1

The correct option is B 0.98

Void ratio, e = 0.7

Specific gravity, $G_s=2.67$

Critical hydraulic gradient

$i_{cr}=\frac{G_s-1}{1+e}=\frac{2.67-1}{1+0.7}=0.98$