盾构隧道近距离下穿城市立交桥施工安全性分析  

Analysis on the Construction Safety of Shield Tunnel Crossing Underneath Urban Overpass with Short Distance

作　　者：吴颖宁[1] WU Yingning(China Railway 18^(th) Bureau Group Co.Ltd.,Tianjin 300222,China)

机构地区：[1]中铁十八局集团有限公司,天津300222

出　　处：《铁道建筑技术》2020年第12期124-126,140,共4页Railway Construction Technology

基　　金：广东省交通运输厅科技项目(2016-02-026);广州市科技计划项目产学研协同创新重大专项(201704020139)。

摘　　要：盾构隧道下穿施工和爆破作业对地面设施的安全性影响不可忽视。本文以广州地铁22号线下穿机电山庄立交桥施工为工程背景,结合立交桥区段工程地质情况,考虑隧道开挖对其周围平衡力系的作用与影响,采用有限元软件对下穿立交桥施工进行静力影响数值模拟分析,同时应用动力学数值模拟方法对典型物理量进行研究总结,据此分析爆破施工对立交桥区段的影响。结果表明,在采用专项施工方案施工的前提下,隧道下穿开挖和爆破作业对立交桥安全性影响均较小。The underpassing construction of shield tunnel and blasting might have great impact on the safety of surface facilities.In order to analyze the influence of blasting construction on overpass section,taking the construction of Guangzhou Metro Line 22 crossing underneath the Jidian village as the engineering background,this paper uses the finite element software to simulate the static influence of the underpassing overpass construction based on combining the engineering geology condition of overpass section and considering the effect and influence of tunnel excavation on the surrounding balance force system.Meanwhile,it uses the method of dynamic numerical simulation to study and summary the typical physical quantities.The results show that the excavation of tunnel and blasting has finite influences on the safety of the overpass in this study as the construction process following a specific construction plan.

关 键 词：盾构隧道 下穿工程 爆破荷载 数值模拟 立交桥段 安全性分析 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]