For concrete gravity dams (having strength of 3000 kN/m2), the limiting value of the height for low gravity dam is approximately: (G(concrete) = 2.4)

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UKPSC JE Civil 8 May 2022 Official Paper-II
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  1. 28 m
  2. 48 m.
  3. 88 m
  4. 68 m.

Answer (Detailed Solution Below)

Option 3 : 88 m
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Detailed Solution

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Concept:

Possible height for concrete gravity dams are given as;

\(H={f\over\gamma_w(G_c+1)}\)

Where f = allowable stress or strength, Gc = specific gravity of concrete, and \(\gamma_w\) = unit weight of water.

Calculation:

Given; f = 3000 kN/m2, Gc = 2.4

\(H={3000\over10\times (2.4+1)}=88.235\approx 88\, m\)

Hence option (3) is the correct answer.

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