徐家河水库溢洪道除险加固工程消能防冲效果试验优化研究

Experimental study of optimization on energy dissipation and erosion control effect on Xujiahe reservoir spillway danger control and reinforcement project

通过1∶50水力学整体模型,针对孝感徐家河水库溢洪道除险加固初步设计方案进行了相关水力学问题的试验验证,并开展了进一步改善溢洪道消能防冲效果方案的优化试验。研究成果表明:溢洪道的泄流能力和消能防冲效果满足设计要求;为改善一、二级消力池及明渠内的流态,可采取在一级消力池内修建T型墩,在明渠内设置消能墩、加糙墩,在一级消力池尾槛顶部左右两侧增设消能墩和将二级消力池尾槛高度降低等优化措施;修建徐家河大桥使明渠内局部水位升高;根据冲刷试验成果,需对汉渝铁路桥墩后及316国道桥墩予以相应的保护。

This study through hydraulic integrated physical model that has the geometrical scale of 1：50,takes verifying experiment of some related hydraulic problems on the primary design program of Xiaogan city Xujiahe reservoir spillway danger control and reinforcement project. At the same time, carrys out optimization experiment on program further improving the energy dissipation and erosion control effect of spillway. The study results show： the flood discharge capacity and energy dissipation and erosion control effect could fulfill the design demand. In order to improve the flow pattern in the first and second stilling pool and in the open channel, some optimization measures could be adapted： building T-shaped pier in the first stilling pool, setting energy dissipation pier and rough pier in open channel, setting energy dissipation piers on both sides of the first stilling pool end profile sill top, reducing the height of the second stilling pool end profile sill. The coh- struction of Xujiahe bridge raises the local water level in open channel. According to the erosion experiment result, it is need to take some proper protections on the back of the HanYu railway bridge pier and the 316 national road pier.