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The pressure at the exit gradient at which the upward force is equal to the submerged weight of the soil is called the ___________

(a) Floatation gradient

(b) Bursting gradient

(c) Critical gradient

(d) All of the mentioned

This question was addressed to me in an online interview.

This interesting question is from Seepage Analysis in chapter Seepage Analysis of Geotechnical Engineering I

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The correct option is (d) All of the mentioned

For explanation I would say: The upward force is equal to the submerged weight of the soil is called the flotation gradient (Terzaghi), or bursting gradient (Haigh) or the critical gradient (Khosla).

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