小间距平行盾构隧道加固方法实例分析

Example Analysis of Reinforcement Method for a Small Spacing Parallel Shield Tunnel

结合天津地铁2号线某区间小间距平行盾构隧道并行的工程实例,以控制后施工隧道对已施工隧道结构的影响为目标,通过对旋喷桩加固和冻结法两种工程措施进行对比分析,确定采用冻结法配合隔离桩加固的方法对此小间距隧道进行加固。简要介绍了工程难点、关键技术方案及施工应急预案等工程实践,为此工程顺利实施提供依据和指导,可供类似工程参考。

Combined with practical work of a small spacing parallel Shield tunnel in Tianjin No.2 metro line,for controling the effect of later constructed tunnel on the earlier constructed tunnel,by comparative analysis of reinforcement method of rotary jet grouting pile and freezing method.At last,freezing method combined with isolation piles has been adopted.Project difficulties,key technology measures and emergency plan are briefly introduced,which provide gist and direction for this project and provide similar engineering reference.