Systematic flood discharge and energy dissipation arrangement method and structure of an asymmetric arch dam

Abstract

The invention provides a systematic flood discharge and energy dissipation arrangement method and structure of an asymmetric arch dam, so that the center line of the flood discharge coincides with or is parallel to the center line of the downstream channel, and forms a certain angle with the center line of the arch dam. The orifices are arranged as multi-layer orifices, and the orifices of each layer are arranged in an asymmetrical arc with a certain angle with the axis of the arch dam. The angle controls the movement trajectory of the water discharge tongue, so that the water tongue is layered and staggered into the center of the water cushion pond. The present invention adopts layered and asymmetric flood discharge orifice arrangement, controls the trajectory of the water tongue, and makes the water tongue conform to the downstream channel, and solves the unfavorable effects of asymmetric arch dam structure and asymmetric topographical conditions on flood discharge safety and bank scour impact and meet the energy dissipation requirements for dam flood discharge.

Description

technical field [0001] The invention relates to an arrangement method and structure for flood discharge and energy dissipation of an asymmetric arch dam, which is suitable for water conservancy and hydropower projects, especially for flood discharge and energy dissipation of asymmetric arch dams with narrow river valleys, large flows, and large terrain differences on both banks. Background technique [0002] Concrete high arch dam projects with narrow river valleys and large discharge capacity usually use multi-layer orifices arranged in the dam body for flood discharge, and downstream water cushion ponds for energy dissipation. The huge energy of the flood discharge flow is dispersed in the air through the multi-layer water tongues, collides (or does not collide), and finally falls into the downstream pad pond to dissipate energy, and then smoothly enters the downstream river channel. Large-scale concrete high arch dam projects in China, such as Ertan Hydropower Station, Xi...

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Problems solved by technology

[0003] However, when encountering more complex dam construction conditions, such as large differences in topography or geological conditions on both sides of the river, resulting in an asymmetric arch dam structure, that is, the curvature and central angle of the left and right banks of the arch dam are very different, and the centerline of the entire arch dam moves toward the same direction. The deflection of the bank has a relatively large angle with the downstream channel. If the conventional layout of the flood discharge orifice and the pool type are still followed, the water tongue will impact the bank slope, the impact pressure of the pool will be concentrated, and the water flow will not flow smoothly into the channel, which will affect the Stability of spandrel resistance body and safety of dam flood discharge

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