无锡市城市防洪利民桥水利枢纽施工期基坑管涌处理

Treatment on piping of foundation pit during construction of Liminqiao Water Control Project for urban flood control of Wuxi

无锡市利民桥水利枢纽二期闸站施工中,基坑内发生了两次管涌。通过原因分析,研究制定了安全可靠、合理可行的处理方案,在闸室墙后填筑纵向土堤,设置咬合桩防渗结构,对发生管涌的闸室墙底板下进行压密注浆。这样从根本上解决了渗漏通道,既满足了施工需要,又获得了永久防渗、防撞功能。

Piping occurred twice in the foundation pit during the construction of the Gate Station in II Phase of Liminqiao Water Control Project in Nanjing. Through the analysis on the causation of the piping, a reliable and feasible treatment scheme is stud- ied and made; i.e. constructing embankment behind the gate chamber wall, arranging secant pile anti-seepage structure and making compaction grouting under the bottom slab of the gate chamber wall where the piping occurred. In this way, the problem of the seepage passage is so solved that not only the requirement of the construction is met, but the functions of anti-seepage and anti-collision are also obtained.