南水北调西四环暗涵安全输水关键问题

Analysis of Operational Safety of the West Fourth Ring Culvert of South-to-North Water Diversion Project

南水北调西四环暗涵是南水北调中线北京段总干渠末端控制性工程,其充水及闸门启闭过渡过程对工程安全运行具有重要的现实意义。通过对西四环暗涵运行中的关键问题进行分析,依据水工模型试验结果和数值模拟结果,对过渡过程中沿线压力变化、通气孔通气性能、管道内气团的变化、运动规律,及其对输水效率的影响等问题进行分析,给出了工程安全运行的方案和运行中需注意的问题,为工程的运行和管理提供了科学依据。

Beijing West Fourth Ring Reach is a control project of the Middle Route of the South to-North Water Diversion Pro ject. Its safety operational is important to the water supply to Beijing. This paper analyzes the key technical problems of opera tion in this project, including the filling process, the gates opening or closing process. Based on the results of physical modeling and numerical simulation, the changes of pressure, the performance of venthole, the movements rules of the bubble, and the efficiency of water transfer in the pipes, etc. are analyzed. At last, the operational problems which should be concerned are solved, and the scientific optimize operational and management schemes are given.