岩溶区域联络通道冻结孔施工难题及对策

Difficulties and countermeasures in constructing the freezing hole of connecting passage in karst area

岩溶区域联络通道冻结孔施工难度大、风险高。依托广州地铁八号线某区间隧道联络通道及泵房冻结法施工实例,分析岩溶区域地层特点,探索冻结钻孔施工工艺,顺利地完成冻结孔施工。总结了岩溶区域冻结孔施工过程中遇到的难题,提出试验孔施工措施、冻结孔施工思路和针对性施工工艺,为类似工程提供参考依据。

It is difficult and risky to construct the freezing hole of the connecting passage in karst area.Based on the construction example of freezing method of connecting passage and pump house in one section of Guangzhou Metro Line 8,the characteristics of stratum in karst area are analyzed,and the construction technology of drilling freezing hole is explored to complete the construction of freezing hole.This paper summarizes the difficulties in the construction of the freezing hole in karst area,and puts forward the construction measures of test hole,the construction ideas of frozen hole and the corresponding construction technology,which can provide reference for similar projects.