新建匝道桥对临近地下结构的变形影响分析  

Analysis of the Influence of the New Ramp Bridge on the Deformation of the Adjacent Underground Structure

作　　者：朱永宏 ZHU Yong-hong(China Railway 18th Bureau Group Co.,Ltd.,Tianjin 300300,China)

机构地区：[1]中铁十八局集团有限公司,天津300300

出　　处：《价值工程》2025年第2期109-112,共4页Value Engineering

摘　　要：随着交通路网建设的不断完善,加之轨道交通系统在城市分布越来越广,不可避免地会出现新建桥梁与既有地下区间隧道相交或者临近的问题,其施工会对邻近隧道结构产生影响。本文以某新建匝道桥为例,采用Madis软件从桩基成孔、承台开挖、上部荷载施加全过程分析各阶段对邻近区间隧道的影响,并深入分析桥梁桩基与区间隧道水平净距的影响关系,研究表明:整个阶段中,桩基成孔阶段影响最大,桩基与既有隧道水平净距对影响程度密切相关,隧道变形随隧道与桩基水平距离的增加而减小,当桩基距离隧道较近时,通过增大桩基与隧道距离,减小隧道变形较为明显。对桥桩施工对临近区间隧道的变形影响规律有了更为直观的认识,为类似工程提供一定借鉴作用。With the continuous improvement of traffic network construction and the increasingly widespread distribution of rail transit systems in cities,it is inevitable that new bridges will intersect or be adjacent to existing underground section tunnels,and their construction will have an impact on adjacent tunnel structures.Taking a newly built ramp bridge as an example,this paper uses Madis software to analyze the impact of each stage on adjacent section tunnels from the entire process of pile foundation hole formation,pile cap excavation,and upper load application,and deeply analyzes the impact relationship between bridge pile foundation and section tunnel horizontal clear distance.The research shows that during the entire stage,the impact of pile foundation hole formation stage is the greatest,and the horizontal clear distance between pile foundation and existing tunnel is closely related to the impact degree.Tunnel deformation decreases as the horizontal distance between the tunnel and the pile foundation increases.When the pile foundation is relatively close to the tunnel,it is more obvious to reduce tunnel deformation by increasing the distance between the pile foundation and the tunnel.A more intuitive understanding of the impact of bridge pile construction on the deformation of adjacent section tunnels has been obtained,providing some reference for similar projects.

关 键 词：桩基成孔 水平净距 全过程 

分 类 号：TU753.3[建筑科学—建筑技术科学]