挑跌流消能防护形式中的水垫塘体型优化探索
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摘要
目前高坝建设中普遍采用的水垫塘形式为平底水垫塘和反拱水垫塘两种。根据对水垫塘内特殊流态及冲刷机理的研究,从高速淹没射流在水垫塘水体中扩散规律,冲击射流压强随射流流程的变化规律等一系列水力要素方面出发,结合冲刷实验的一系列成果,对水垫塘体型曲面进行优化。分别从水垫塘的横向剖面和纵向剖面的具体情况分析并作出相应的变化,在反拱水垫塘的基础上改进成在纵向剖面也曲线变化的双曲反拱,使水动力要素和水垫塘结构动力要素处于一种和谐状态,保障水垫塘的安全运行。
Water cushion pool form in the construction of high dam at present as a water cushion pool generally has two forms,namely flat bottom water cushion pool and anti arch water cushion. Based on the research of water cushion pool special pattern and scouring mechanism,from the diffusion law of high speed submerged jet in a water cushion pool,impinging jet pressure changes with the jet flow etc.,various hydraulic factors,combined with a series of achievements scouring experiment,the water cushion pool shape surface optimization is conducted. From the concrete conditions of the water cushion transverse section and longitudinal profile analysis is carried out and corresponding changes are made. On the basis of the anti arch water cushion pool the curve is also changed into hyperbolic inverted arch on the longitudinal profile,making hydraulic factors and dynamic factors of water cushion pool be in a harmonious state and ensuring the safe operation of water cushion pool.
Water cushion pool form in the construction of high dam at present as a water cushion pool generally has two forms,namely flat bottom water cushion pool and anti arch water cushion. Based on the research of water cushion pool special pattern and scouring mechanism,from the diffusion law of high speed submerged jet in a water cushion pool,impinging jet pressure changes with the jet flow etc.,various hydraulic factors,combined with a series of achievements scouring experiment,the water cushion pool shape surface optimization is conducted. From the concrete conditions of the water cushion transverse section and longitudinal profile analysis is carried out and corresponding changes are made. On the basis of the anti arch water cushion pool the curve is also changed into hyperbolic inverted arch on the longitudinal profile,making hydraulic factors and dynamic factors of water cushion pool be in a harmonious state and ensuring the safe operation of water cushion pool.
引文
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[3]练继建,杨敏,安刚,胡明是反拱型水垫塘底板结构的稳定性研究[J].水利水电技术,2001(12):24-26;76.
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