Practical profile of a gravity dam -

Practical profile of a gravity dam –

  • The elementary profile cannot be adopted as such. Some modifications have to be incorporated, to make it adaptable in practice.
  • Modifications in elementary profile are necessitated due to following reasons:

1. Some free board is essential whereas elementary profile does not provide any free board.

2. Road way is generally provided at the top of the dam. This necessitates quite thick top of the dam, whereas elementary profile does not provide any thickness at the top.

3. Additional load due to extra height, provided for free board and also due thick top of the dam, induces some additional stress in the dam section.

  • Some extra darn section has to be provided at the base of the dam along the U/S face to counter act such additional stresses.
  • The amount of free board usually provided is 1.5 hw where hw is the height of waves in metres between through and crest.
  • Minimum top width of the dam should be about one-seventh the

Fig. 13.10. Practical profile of low gravity dam.

3. Additional load due to extra height, provided for free board and also due thick top of the dam, induces some additional stress in the dam section.

  • Some extra darn section has to be provided at the base of the dam along the U/S face to counter act such additional stresses.
  • The amount of free board usually provided is 1.5 hw where hw is the height of waves in metres between through and crest.
  • Minimum top width of the dam should be about one-seventh the depth of the water fill.

 

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