复杂地层地铁旁通道冻结孔施工技术

Construction Technology of Freezing Holes for a Metro Bypass in Complex Stratum

在复杂地层中,对地铁旁通道采用水平冻结法施工是一种有效手段,而冻结孔施工又是旁通道工程的关键工序之一。结合上海地铁十一号线祁连山—真南路站区间旁通道施工实例,介绍了含承压水的砂性土复杂地层中旁通道冻结孔的施工技术,包括壁后预注浆加固、冻结孔开孔以及夯管等技术,对类似地质条件下旁通道冻结孔施工具有一定的参考价值和指导意义。

Horizontal ground freezing for bypass construction is one of the effective methods for complex stratum. Construction of freezing holes is one of key processes. In the light of the bypass construction of Shanghai subway Line 11 on the section from Qilianshan Road to Zhennan Road, the article describes systematically the technology of ground freezing holes drilling in complex stratum with pressure water and sandy soil, including pre-grouting behind segments, opening of freeze holes and tamping pipe method. The practice is valuable and helpful for drilling of ground freezing holes under similar geological conditions.