钻孔引发基坑管涌事故的分析与处理对策

Analysis on Foundation Pit Piping Accident Caused by Drilling and the Treatment Countermeasures

地下室开挖与基础施工过程中,当坑底存在承压水,如设计考虑不周或施工方法不当,因钻孔穿透承压含水层等原因,将导致管涌发生。结合浙江宁波某基坑管涌处理工程实例,提出采用钢套管、高压旋喷桩、双液注浆的综合处理技术,实践证明,提出的技术可以有效处理类似事故。

When there is confined water at the bottom of foundation pit in the basement excavation and foundation construc- tion process, if the design is inconsiderate or the construction operation are improper, piping will occur caused by drilling through confined aquifer. According to the engineering case of a foundation pit piping treatment in Ningbo, steel casing, high pressure jet grouting pile and double fluid grouting comprehensive processing technology are presented in this paper, the above technologies can effectively deal with the similar accidents.