南水北调中线陶岔至鲁山段渠道防渗排水设计

Anti-seepage and drainage design for Taocha to Lushan section of South-to-North Water Diversion project

为了减少南水北调中线工程总干渠的输水损失,采用渠道全断面现浇混凝土衬砌的防渗措施,对于土质较好且渗透系数较小的全挖方渠段,能够起到较好的防渗作用。针对存在侧向或者垂直渗漏问题的渠段,采用复合土工膜加强防渗。对于衬砌结构在地下水位高于渠水位时可能发生失稳的安全隐患,设计了由排水垫层、透水软管和逆止阀等配套的排水设施,并在渠坡采用塑料排水盲沟作为排水垫层。现场施工实践表明,这些排水措施取得了良好效果。

In order to reduce water delivery loss of Main Canal in Middle Route Project of South-to-North Water Diversion, the anti-seepage measures of whole-section concrete lining was adopted, which is effective for the whole-excavated canal with better geotechnical condition and small permeability coefficient. But for canal section with lateral and vertical seepage problem, the composite geo-membrane is necessary to strengthen the anti-seepage design. The lining structure might be unstable in the case of underground water higher than canal water;therefore the drainage solution, consisted of drainage blanket, pervious hose and check valve, was designed and the plastic blind drainage ditch was used in canal slope. The in-situ practice shows that the drainage measures were effective.