引江济淮工程杭埠河倒虹吸基坑地下水控制设计

Underground water control design for Hangbu River inverted siphon foundation pit of Yangtze River-to-Huaihe River Water Diversion Project

介绍了安徽省引江济淮工程杭埠河倒虹吸工程的基本情况,分析了其工程地质和水文地质。由于基坑开挖深度大、砂层承压水头高,施工期间面临的地下水控制问题难度较大,通过比较深井降水(采用承压—潜水完整井干扰井群公式计算)和地下连续墙围封两种方案,最终选定基坑围封方案。并论述了地下连续墙设计和施工中需要注意的问题。

An introduction was made on the general information of the Hangbu River inverted siphon work, one of the components of Yangtze River-to-Huaihe River Water Diversion Project. The engineering and hydrological geological conditions were analyzed. Deep excavation and sand layer withstanding high water pressure will lead to great difficulties for underground water control during the construction of foundation pit. Two alternatives of deep well dewatering and enclosed underground diaphragm wall were compared before the enclosed diaphragm wall scheme was selected, of which the deep well calculation was conducted with the formula of interference wells group for pressurediving complete wells. The author discussed the issues in need of special attention during design and construction of underground diaphragm wall.