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  1. resultant can be anywhere
  2. resultant, base should be within the middle third of the width
  3. resultant, base should be within a third of the width
  4. resultant, base should be in the middle of the width
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Option 2 : resultant, base should be within the middle third of the width

Explanation:

Modes of failure and criteria for structural stability of gravity dam:

A gravity dam may fail in the following way:

  1. By overturning about the toe.
  2. By crushing.
  3. By development of tension, causes ultimate failure by crushing.
  4. Shear failure is called sliding.

By development of tension, causes ultimate failure by crushing:

  • maximum permissible tensile stress for high concrete gravity dam, under worst leading, may be taken as 500 kN/m2 or 5 kg/cm2
  • The maximum value of eccentricity that can be permitted on either side of center is equal to B/6; So that, the resultant must lie within the middle third.
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