The specific gravity and insitu void ratio of a soil deposit

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The specific gravity and insitu void ratio of a soil deposit are 2.71 and 0.85 respectively. The value of the critical hydraulic gradient is

1. 0.82
2. 0.85
3. 0.92
4. 0.95

Correct Option: C

Critical hydraulic gradient,

i_c =	G - 1
	1 + e

=	2.71 - 1	= 0.924
	1 + 0.85