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The bottom portion of a concrete or a masonry...

The bottom portion of a concrete or a masonry gravity dam is usually stepped in order to _______

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asked Sep 5, 2023 in Irrigation Engineering by Carter (75.2k points)

The bottom portion of a concrete or a masonry gravity dam is usually stepped in order to _______

(a) increase the overturning resistance of the dam

(b) increase the shear strength

(c) decrease the shear strength

(d) increase the frictional resistance

This question was addressed to me in final exam.

I'm obligated to ask this question of Gravity Dams topic in chapter Gravity Dam Design and Construction of Irrigation Engineering

irrigation engineering
gravity dam design and construction
gravity dams

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1 Answer

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answered Sep 16, 2023 by Greg (106k points)

Correct choice is (b) increase the shear strength

The explanation: The foundation is stepped at the base to increase the shear strength at the base and at other joints and measures is taken to ensure a better bond between the dam and the rock foundation. By ensuring a better bond between the surfaces the shear strength of these joints should be made as good as possible.

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