小间距平行盾构隧道施工的反分析研究

结合北京地铁十号线三元桥站～亮马河站区间盾构隧道工程,提出了根据监测数据对两条盾构隧道小间距、长距离并行施工相互影响进行反分析的方法,并根据工程实施过程中的监测数据,分别对盾构隧道环向和纵向的内力进行了分析,指导了施工。研究表明,当两条盾构隧道小间距、长距离并行施工时,会出现后行盾构隧道对先行隧道先挤压、后卸载的情况,引起先行隧道环向的内力变化,与实际监测的数据吻合。该研究方法及工程实践结论可以为地铁类似工程的设计、施工、监测提供参考。

Back Analysis on Construction of Parallel Shield Tunnels with Small Spacing

Based on the project of two shield tunnels between Sanyuanqiao station and Liangmahe station of Beijing subway line 10, the back analysis method according to monitoring data of interaction between two small spacing shield tunnels in long parallel distance is proposed. Based on monitoring data, the crosswise and lengthwise internal forces of shield tunnel were analyzed, which was used to guide the construction of the shield tunnel. Study indicates that latter shield tunnel may press and unload front shield tunnel and causes internal force change of front shield tunnel in construction of two small spacing shield tunnels in long parallel distance, which coincides to monitoring data in construction. The research method and engineering practice rules can be used for reference in design, construction and monitoring of subway and analogous projects.