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Which failure occurs when the net horizontal force above any plane in the dam or at the base of the dam exceeds the frictional resistance developed at that level?

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in Irrigation Engineering by (75.2k points)
Which failure occurs when the net horizontal force above any plane in the dam or at the base of the dam exceeds the frictional resistance developed at that level?

(a) Overturning

(b) Crushing

(c) Sliding

(d) BY development of tension

The question was posed to me in an online interview.

Question is from Gravity Dams topic in section Gravity Dam Design and Construction of Irrigation Engineering

1 Answer

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by (106k points)
Right answer is (c) Sliding

Explanation: Sliding should always be fully resisted. At any horizontal section of the dam, the factor of safety against sliding is –

FOS = u Ph / Pv where u = coefficient of friction, Ph = Sum of horizontal forces causing sliding and Pv = Algebraic sum of vertical forces.

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