某水库溢洪道优化设计模型试验研究

泄流消能设施的合理设计对保证水利工程的安全运行具有重要意义.本文采用模型试验的方法对某水库溢洪道结构设计进行优化研究.试验结果显示，溢洪道原设计方案的泄流能力不能满足设计要求，一级泄槽和二级泄槽段边墙高度较低，富余度明显不足，迷宫堰的背坡面部位存在比较明显的负压区.针对原设计方案，提出了增加迷宫堰的总宽度，缩短泄槽段长度，增加溢洪道泄槽段边墙高度，减小泄槽进口的宽度以及增加挑流鼻坎长度的优化方案.优化方案条件下的过流能力和边墙高度满足过流要求，沿程基本无负压，空化影响可以忽略不计，下游冲刷不会对工程运行造成比较明显的负面影响，基本满足设计要求，建议在工程设计中采用.

英文摘要:

The reasonable design of discharge and energy dissipation facilities is of great significance to ensure the safe operation of water conservancy projects.According to the design data of a reservoir，the hydraulic test model is made，and the structural design of spillway is optimized by the method of model test.The research results show that the discharge capacity of the original design scheme of the spillway can not meet the design requirements，the height of the side walls of the first and second stage steep slopes is low，the margin is obviously insufficient，and there is a relatively obvious negative pressure area on the back slope face of the labyrinth weir.According to the original design scheme，the optimization scheme is proposed to increase the total width of labyrinth weir，shorten the length of steep slope section，increase the height of side wall of steep slope section of spillway，reduce the width of chute inlet and increase the length of flip bucket.The model test results show that the flow capacity and the height of the side wall under the condition of the optimized scheme meet the flow requirements，there is basically no negative pressure along the way，the cavitation effect can be ignored，and the downstream scouring will not have a significant negative impact on the operation of the project， fully meeting the design requirements， which is recommended to be used in the engineering design.

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