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The major principal stress at the toe of a gravity dam under full reservoir condition neglecting the tailwater effect is given by ____________________

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in Irrigation Engineering by (75.2k points)
The major principal stress at the toe of a gravity dam under full reservoir condition neglecting the tailwater effect is given by ____________________

(a) Pv

(b) Pv tanQ^2

(c) Pv secQ^2

(d) Pv sinQ^2

This question was posed to me in a national level competition.

My question comes from Gravity Dams in section Gravity Dam Design and Construction of Irrigation Engineering

1 Answer

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by (106k points)
The correct answer is (c) Pv secQ^2

Best explanation: When there is no tailwater, the principal stress in such a case is Pv secQ^2 where Pv is the intensity of vertical pressure. This value of principal stress should not be allowed to exceed the maximum allowable compressive stress of dam material.

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