Overflow dam with dam face cantilever sills for current diversion and energy dissipation

Abstract

The invention discloses an overflow dam with dam face cantilever sills for current diversion and energy dissipation. The tank bottom of an energy dissipation tank is connected to the rear part of an overflow slop of the overflow dam. A protection side wall of the energy dissipation tank is connected to the rear part of a side wall of the overflow slope. A plurality of gate piers used for dividing a fluid flow-by area into a plurality spillway are arranged on the dam top of the overflow dam. The overflow slope of the overflow dam is provided with a plurality of current diversion cantilever sills distributed in a spaced manner, so that one part of water current coming from the spillways flows through the upper sill surfaces of the cantilever sills and enters the rear area of the energy dissipation tank in a form of cantilever current while the other part of water current flows into the front area of the energy dissipation tank through flow channels between each two cantilever sills and achieves energy dissipation through dispersion of the water current entering the energy dissipation tank. The energy dissipation mode provided by the invention is totally different from those in the prior art and is distinct in energy dissipation effect.

Description

technical field [0001] The invention belongs to the field of flood discharge and energy dissipation of hydraulic structures in water conservancy and hydropower projects, and in particular relates to an overflow dam whose dam surface is designed with a ridge diversion energy dissipation structure. Background technique [0002] In water conservancy and hydropower projects, the gravity dam is a commonly used dam type. Generally speaking, the construction material of the gravity dam is concrete, so the dam body is often used for flood discharge. For an overflow dam that discharges flood through the dam body, a stilling basin is generally built behind the dam, and a hydraulic jump is used to dissipate energy. However, the energy dissipation rate of the hydraulic jump is generally low, ideally about 60-70%, sometimes even smaller. [0003] With the increase of the height of the dam, the velocity of the discharged water also increases rapidly, and its energy also increases rapidly...

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Problems solved by technology

[0005] However, as the height of the dam increases, the water flow stretched by the wide-tail pier will concentrate during the movement in the air. The effect is that the velocity of the water flow in the upper layer is small and the velocity of the water flow in the lower layer is large. Therefore, when the air movement distance is large, the trajectories of the water flow emitted from different positions will intersect, which will cause the water flow to concentrate again after being stretched. After the water flow is concentrated, the counteracting force The impact effect on the front end of the pool will be greatly increased, and excessive impact pressure will damage the bottom plate of the stilling pool. In addition, the energy dissipation effect will become poor after the water flow is concentrated

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