机场枢纽近磁浮区域超深基坑地下水控制技术

在城市机场复杂交通枢纽区域，如何综合有效的管控超深基坑中出现的复合承压含水层，已成为上海地区超深基坑明挖建设中必须解决的一个关键技术问题。上海机场联络线浦东机场站位于上海浦东机场交通枢纽核心区机场主干道-迎宾大道正下方，项目基坑范围内地层受古河道切割影响，南北向地质条件起伏大，⑥层和⑧层缺失，⑦层和⑨层承压水联通。车站主体结构与邻近磁悬浮桩基础距离仅为26.5 m，周边环境保护要求也极高。为满足基坑和环境的双安全，项目进行了复合承压含水层组的围护+降水综合设计，再通过抽水试验验证分析，确保降水方案实施的可靠性，通过基坑开挖阶段动态管控，最终达到预期承压水控制的目标。

Groundwater Control Technology for Ultra Deep Foundation Pit near Maglev Area in Airport Hub

In the complex transportation hub area of urban airports, how to comprehensively and effectively control the composite confined aquifer appearing in ultra-deep foundation pits has become a key technical problem that must be solved in the excavation construction of ultra-deep foundation pits in Shanghai. Pudong Airport Station of the airport liaison line in Shanghai is located directly below the main road - Yingbin Avenue of the airport in the core area of the transportation hub of Shanghai Pudong Airport. The stratum in the range of the project foundation pit is affected by the cutting of ancient river channels, and the north-south geological conditions fluctuate greatly. Layers ⑥ and ⑧ are missing, and layers ⑦ and ⑨ are connected by confined water. The distance between the main structure of the station and the adjacent pile foundation of the maglev is only 26.5 m, and the surrounding environmental protection requirements are also very high. In order to meet the dual safety of the foundation pit and the environment, the integrated design of enclosure and dewatering for the composite confined aquifer group is carried out in the project, and then is verified and analyzed through the pumping tests to ensure the reliability of the implementation of the dewatering scheme. Through the dynamic control in the excavation stage of the foundation pit, the expected goal to control the confined water is finally achieved.