基坑近接既有地铁隧道的施工工序研究

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【DOI编码】：10.3969/j.issn.1008-3197.2025.03.006

Research on Construction Procedure of Foundation Pit Adjacent to Existing Subway Tunnel

GUO Jijie'，ZHANG Xiaoli²*，LI Dayong'，GU Yongcai² （1.JinanRailTransit GroupCo.Ltd.，Jinan25o14，China;2.ChinaRailwaySixth SurveyandDesignInstituteGroupCo.Ltd. Tianjin ，China）

【Abstract]：Inorder to mitigate the impactof foundation pit excavation on existing tunnels，a case studywas conducted on afoundation pit adjacent to the Jinan Metro Line 2.Through numerical simulation analysis，the influenceof three excavation processes （layer-by-layer，section-by-section，and combined layer-section）on tunnel vertical displacement was systematically investigated.Comparative analysis demonstrated that the layer-section excavation method exhibited the leastimpact on tunnel deformation andaxial force，validated byboth numerical simulation and field monitoring data.

【Key words】： foundation pit;tunnel;excavation and unloading;construction process

随着我国地下空间开发进程的加快，基坑近接既有地铁隧道的案例越来越多。（剩余5252字）