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针对某水电站大坝坝址河谷狭窄、水头高、洪水峰高量大,致其泄洪消能措施复杂的问题,通过1∶100水工整体模型优化坝身泄流建筑物体型,表孔采用单边扩散加齿坎,中孔采用平底型及上翘型。模拟结果表明,优化方案实现了各孔水流在跌落下降过程中的碰撞扩散消能,有效减小了下泄水流射入水垫塘的动水压力,底板冲击压力由284.5kPa下降到137.3kPa以下,较好地解决了泄洪消能问题,保证了大坝和消能建筑物的安全。
Aiming at the problem that the dam site of a certain hydropower station has narrow valley, high water head and large flood peak, which leads to the complicated flood discharge and energy dissipation measures, the 1: 100 hydraulic overall model is used to optimize the body structure of dam body, Edge diffusion plus tooth, the hole using flat-bottom and upturned. The simulation results show that the optimization scheme can achieve the collision diffusion and dissipation of the water flow in each hole during drop-down process, and effectively reduce the hydrodynamic pressure of the discharged water jetting into the plunge pool. The impact pressure of the base plate drops from 284.5 kPa to 137.3 kPa, The problem of flood discharge and energy dissipation is well solved, and the safety of dams and energy-dissipating buildings is guaranteed.