南水北调中线工程横跨江、淮、黄、海四大流域,是我国特大型调水工程。其中,铁路渠道倒虹是总干渠渠道下穿越铁路的渠道铁路交叉建筑物。南水北调中线工程总干渠设计为自流输水,水头紧张,分配给每座渠倒虹的设计水头都很少,因此在大流量、小水头的设计条件下,渠倒虹过水断面必然较大,为了保障运行安全前提下控制投资、减小占地,需对倒虹吸的总体布置进行分析和合理的优化。 South-to-North Water Diversion Project across four river basins, Huai, Huang and Hai Basin, is China’s large-scale water diversion project. Among them, the railway channel inverted rainbow is the main canal channel through the railway crossing the railway crossing buildings. The design of the main canal of the mid-route of the South-to-North Water Diversion Project is due to the gravity flow and the water head is tight. Fewer head designs are allocated to each canal. Therefore, under the design conditions of large flow and small water head, In order to control the investment under the precondition of operation safety and reduce the land occupation, the overall arrangement of inverted siphon needs to be analyzed and optimized reasonably.