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南水北调中线永定河倒虹吸工程需穿越永定河左堤和五环公路,为不中断道路交通,施工中采用了浅埋暗挖技术并获得了成功,为在卵砾石地层中开挖较大断面的平顶直墙式输水隧洞积累了宝贵经验,就其主要技术环节进行了论述。
The Yongding River inverted siphon project in the middle route of the South-to-North Water Diversion Project has to cross the Yongdinghe Left Bank and the Fifth Ring Road. In order not to interrupt the road traffic, a shallow buried tunneling technique was adopted during the construction and was successful. In order to excavate a large section in the gravel stratum Flat-ceiling straight-walled water diversion tunnel has accumulated valuable experience on its main technical aspects were discussed.