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If a tension crack is developed at the top of wall to a depth Zo in cohesive soils, then the total net pressure is zero for a depth of _________

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in Geotechnical Engineering II by (93.7k points)
If a tension crack is developed at the top of wall to a depth Zo in cohesive soils, then the total net pressure is zero for a depth of _________

(a) 2Zo

(b) 3Zo

(c) 4Zo

(d) 5Zo

This question was posed to me in quiz.

My doubt is from Active Earth Pressure of Cohesive Soils in section Failure Envelopes & Earth Pressure of Geotechnical Engineering II

1 Answer

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by (243k points)
Correct option is (a) 2Zo

For explanation: A negative pressure develops and because of it, a crack is developed in the soil upto a depth Zo. The sum of negative pressure and the positive pressure will be compensated at a depth of 2Zo. Hence, the total net pressure is zero for a depth of 2Zo.

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