复杂环境下地铁车站导洞开挖施工方法对比研究  

Comparative Study on Construction Methods of Subway Station Guide Tunnel Excavation under Complex Environment

作　　者：卢宇 赵伟 LU Yu;ZHAO Wei(Changchun Construction Engineering Quality Supervision Station,Changchun Jilin130000,China;China Railnay ERJU 4th Engineering Co.,Ltd.,Chengdu Sichuan610000,China)

机构地区：[1]长春市建设工程质量监督站,吉林长春130000 [2]中铁二局第四工程有限公司,四川成都610000

出　　处：《北方建筑》2024年第4期121-126,共6页Northern Architecture

摘　　要：为了探究不同隧道开挖方法在地铁车站结构受力和沉降方面的影响差异,本研究以长春地铁5号线工农大路车站为实际案例,运用MIDAS FEA软件对两种施工方法(一次扣拱暗挖逆作法和PBA工法)进行模拟分析。比较这两种方法在施工过程中的差异,分析结果显示,在导洞开挖支护施工阶段,一次扣拱暗挖逆作法导致的地表沉降量最大,占总沉降量的59.14%。而PBA工法在二衬扣拱施工阶段起到较为关键的作用,该阶段所引起的地表沉降量占总沉降量的42.65%。对于拱顶沉降,一次扣拱暗挖逆作法的拱顶沉降较为稳定,而PBA工法的拱顶沉降在不同的施工时间都有大幅度的变动。在其他方面,一次扣拱暗挖逆作法相较于PBA工法具有较小的影响,结构更为稳定,可进一步降低施工风险。In order to explore the differences in the influence of different tunnel excavation methods on the stress and settlement of subway station structures,this study takes the Gongnong Road Station on Line 5 of Changchun Metro as an actual case,and uses MIDAS FEA software to simulate and analyze two construction methods(one-time arch excavation reverse method and PBA method).Comparing the differences between these two methods during the construction process,the analysis results show that during the excavation and support construction stage of the pilot tunnel,the maximum surface settlement is caused by one-time arch excavation reverse method,accounting for 59.14%of the total settlement.The PBA construction method plays a crucial role in the construction stage of the secondary lining arch,and the surface settlement caused by this stage accounts for 42.65%of the total settlement.For the settlement of the arch crown,the settlement of the arch crown is relatively stable under one-time arch excavation reverse method,while the settlement of the arch crown under the PBA construction method varies significantly at different construction times.In other aspects,one-time arch excavation reverse method with a single arch buckle has a smaller impact compared to the PBA method,and the structure is more stable,which can further reduce construction risks.

关 键 词：地铁车站 导洞开挖 一次扣拱暗挖逆作法 PBA工法 施工方法 

分 类 号：U231.3[交通运输工程—道路与铁道工程]