Considering maximum and minimum stress at the base of a dam, it will be correct to assume that:

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SSC JE Civil 16 Nov 2022 Shift 1 Official Paper
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  1. maximum stress in reservoir empty condition is expected at heel of base
  2. for no tension to develop, resultant stress must lie outside the middle third of base width
  3. tension is allowed to be developed at a point of the base in the masonry dam
  4. tension is developed if eccentricity is less than B/6

Answer (Detailed Solution Below)

Option 1 : maximum stress in reservoir empty condition is expected at heel of base
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Detailed Solution

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Explanation:

The maximum stress under empty reservoir condition occurs at heel of base because in empty reservoir condition resultant force shift towards heel of base and increases uplift at heel.

Uplift pressure or stress at the base of dam is given by: \(\sigma_{max} =\sum \frac{w}{b}\left ( 1+\frac{6e}{b} \right ) \) , Uplift pressure distribution below gravity dam is shown below:

  Screenshot 2022-12-09 at 10-56-49 distribution of stress at the base of the dam under empty reservoir condition - Google Search

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