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Question

Following data were obtained from the stability analysis of a concrete gravity dam:
Weight of the dam = 6500 tonnes/m
Uplift force = 1500 tonnes/m
Base width of dam = 60 m
The resultant force acts at 25 m from the toe.
The maximum vertical stress on the foundation soil will be

A
291.67 t/m2
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B
125 t/m2
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C
41.67 t/m2
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D
162.5 t/m2
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Solution

The correct option is B 125 t/m2
Since resultant force acts at 25 m from the toe,
Eccentricity, e = 30 - 25 = 5 m

Maximum vertical stress,
Pmax=FvB[1+6eB]
Pmax=6500150060[1+6×560]=125 t/m2

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