南水北调中线京石段隧洞工程设计浅议

The Preliminary Discussion on the Design for Tunnels of South-to-North Water Diversion Project (from Beijing to Shijiazhuang)

南水北调中线工程属特大型远距离跨流域调水工程,其工程等别为一等,主要建筑物为1级建筑物。南水北调中线京石段内共设置7座隧洞,隧洞总长为9642m,其中隧洞洞身长8626m,其共同的特点是：长距离、大流量、低水头。设计中创造性地提出了一些新观点,如通过采用双洞线布置、合理降低进口底高程、减糙混凝土的应用、进出口涵洞段的布置等措施,提高了总干渠的输水保证率,节约了投资,节省了水头,提高了工程的安全度,并为以后类似工程提供参考。

The South-to-North Water Diversion Project(Middle Route)is belong to the largest water diversion project with large scale and long distance.The grade of the project and its main buildings are determined as“Class A”.There are 7 tunnels are arranged on south-to-north water diversion project(from Beijing to Shijiazhuang)with die total length of 9.642m,in which die tunnel body is 8.626m.The long distance,big discharge and lower water head are the common characteristics of the project.In the design of this project,some new viewpoints are put foreword.For example,the water dehvery efficiency of the general canal is increased,the cost is saved,the safety of the project is raised and provide the reference for the similar project in future by using the arrangement with double lines,decraesing the bottom elevation of inlet reasonably,deducing the usage of rough concrete and optimizing the arrangement of the sections of culverts at inlet and outlet.