A three-dimensional grid structure and energy dissipation method for energy dissipation of a discharge gravity dam

Abstract

The invention discloses an energy dissipation three-dimensional grating structure of a sluicing gravity dam. The energy dissipation three-dimensional grating structure is mounted at the bottom of a watercourse of the sluicing gravity dam and comprises four layers of grating grids. Each layer of grating grids comprises a grid part and a non-grid part which is formed by a tough woven net. The four layers of grating grids are sequentially the first layer grating, the second layer grating, the third layer grating and the fourth layer grating from top to bottom. The first layer grating and the third layer grating are distributed in a triangular mode, and the second layer grating and the fourth layer grating are distributed in a rhombic mode. By adoption of the three-dimensional grating structure, sluicing waterflow can depend on the multi-layer energy dissipation gratings, the vertical flowing speed can be decomposed out under the effect of gravity, a layered flowing energy dissipation effect is generated, and a flowing state is relatively stable.

Description

technical field [0001] The invention belongs to the technical field of energy dissipation for a discharge gravity dam in water conservancy and hydropower projects, and in particular relates to a three-dimensional grid structure and an energy dissipation method for a discharge gravity dam. Background technique [0002] In water conservancy projects, the discharge gravity dam is both a water retaining structure and a discharge structure, and its discharge methods include dam crest overflow and dam body discharge holes. In water conservancy projects, the discharge gravity dam can undertake tasks such as flood discharge, water delivery to the downstream, sand discharge, emptying of the reservoir and construction diversion. When the high-head discharge gravity dam discharges water, due to the high flow rate (up to 30-40m / s), the high-speed water flow generated will cause serious erosion damage to the downstream riverbed, and even cause bank slope collapse and dam failure. Theref...

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Problems solved by technology

The main principle of energy dissipation in these ways is to generate a hydraulic jump, which converts the rapid flow from the drainage structure into a slow flow, and relies on the strong turbulence between the surface vortex generated by the hydraulic jump and the main flow at the bottom, shearing and mixing. Mixing is used to eliminate the energy of the water flow. Although the purpose of energy dissipation can be achieved, it also makes the flow state of the discharged water flow and its instability, which will cause additional damage to the river bed.

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