GALLERIES IN GRAVITY DAMS

## Galleries in gravity dam

GALLERIES IN GRAVITY DAMS Galleries have to be left in the gravity dams during their construction. The size of the galleries depends upon the purpose, they have to perform. The galleries may be aligned both along the axis and across the axis of the dam. They are provided at all the levels of the dam. All the galleries are given some longitudinal slope and small channels along both the edges of the galleries are formed. Seeping water through the dam section is collected by the channels running along the galleries. Since channels have longitudinal slope, the collected water in channels keeps on flowing automatically and is collect at some central place from where it is discharged into the D/S side of the dam. Galleries are constructed to perform the following functions. 1. It may be cement concrete or masonary dam, some water definitely seeps through the joints and pores of…

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PROFILE OF HIGH MASONRY GRAVITY DAM

## Profile of high masonry gravity dam

PROFILE OF HIGH MASONRY GRAVITY DAM Mr. G. Molesworth gave the following formulae for fixing. These formulae are applicable for masonry gravity dams only. $x= \sqrt{\frac{1.76y^{3}}{p_{a+1.06y}}}$ But value of x should not exceed y ρ at any cost $Z= \frac{y}{36.5p_{a}}$ where x = D/S offset from the vertical line also known as axis of the dam at a depth y below the maximum reservoir level. Z = U/S offset from the vertical line at a depth y metres. b1 = Base width of the dam at 4 h below the full reservoir level. a = Thickness of the dam at the full reservoir level. It is taken as 0.4 b1. pa = Allowable compressive stress for masonry in t/m2, the value of which may vary between 77 to 110 t/m2.

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