岩溶地区地铁车站基坑降水井封堵存在问题及对策

Problems and Countermeasures of Dewatering Well Plugging in Foundation Pit of Metro Station in Karst Area

地铁车站施工大多采用明挖基坑,施工过程中需要进行降水,一般采用钢管降水井进行坑内降水,利用降水井将开挖范围内土体疏干,完成车站封顶后再进行降水井的后封堵,但在南方地区特别是广花盆地,岩溶地区地下水丰富复杂,传统的封堵方法存在封堵质量差、多次返工等现象,本文结合地铁车站施工实例,采用内置止水环封堵技术解决了这一难题。

During construction of foundation pit,we need some dewatering wells in the pit and need to plugging the dewatering wells after the structure completed. In the area of karst, groundwater is rich and complex. The traditional plugging methods has poor quality and multiple rework. Combining with the construction examples of subway station,this paper solve the problem successfully by using the built-in seal ring sealing technology.