南水北调总干渠穿沁倒虹吸工程水力计算

结合南水北调总干渠穿沁倒虹吸工程水文地质条件和相关工程规范,对河道壅水以及行洪口门冲刷深度进行水力计算,初步确定了穿沁倒虹吸长度。同时对不同流量下倒虹吸的水头损失进行水力计算,得到流量与水头损失的关系。根据水力计算成果再对倒虹吸布置进行校核,对倒虹吸工程的合理设计具有一定价值,也可为类似工程设计提供参考。

Hydraulic calculation on Qinhe River-Crossing Inverted Siphon of main canal of South-to-North Water Transfer Project

According to the hydrogeological condition of Qinhe River-Crossing Inverted Siphon of the main canal of the South-to-North Water Transfer Project and the related engineering specification for it， the hydraulic calculations on the backwater in the river channel and the scouring depth at the flood discharge opening are made herein， and then the length of the inverted siphon is preliminarily determined. Meanwhile， the hydraulic calculation is made on the head loss of the inverted siphon under the conditions of different flow rates and the relationship between the flow rate and the head loss is accordingly obtained as well. On the basis of the results from the hydraulic calculations， the layout of the inverted siphon is then checked; which not only has a certain value for the reasonable design of the inverted siphon， but can also provide a reference for the design of the similar project.