大型渠道衬砌结构抗滑稳定性研究

Stability analysis of lining structures of large-scale canal

南水北调中线一期工程总干渠明渠边坡坡比一般为1∶2.0-1∶3.5,渠道采取混凝土薄衬砌,衬砌板下铺设复合土工膜进行防渗,复合土工膜下设置砂砾料（或粗砂）作为排水垫层。其中,保证衬砌结构的抗滑稳定性是渠道设计的一项重要内容。对南水北调中线工程渠道衬砌结构设计与施工中存在的问题进行了分析,对坡脚齿墙结构体型进行了优化,对衬砌结构抗滑稳定性分析应注意的问题进行了探讨,可为南水北调中线工程渠道及其他大型渠道的设计与施工提供借鉴。

The slope ratios of main canal of Phase I Works of Middle Route Project of S-N water diversion are usually 1：2.0-1：3.5.Thin lining concrete structures and composite geo-membrane under the lining are adopted for seepage prevention of the main canal,and sandy gravel materials under the composite geo-membrane are taken as drainage cushion.The anti-sliding analysis of lining structures is the main technical issue for canal design.We discuss the existing problems in the design and construction of channel lining structure;optimize the type of cut-off wall at slope toe,and point out the concerned problems in anti-sliding analysis of lining structure.The results are valuable to the design of main canal of S-N Water Diversion Projects and other large canals.