市政高架桥上跨地铁隧道结构的桩基基础方案分析  

Analysis of Pile Foundation Scheme of Urban Viaduct Over-crossing Metro Tunnel Structure

作　　者：白凌峰 王琪 付波 BAI Lingfeng;WANG Qi;FU Bo(Chengdu Tianfu New Area Construction Investment Co.,Ltd.,610045,Chengdu,China)

机构地区：[1]四川成都天府新区建设投资有限公司,成都610045

出　　处：《城市轨道交通研究》2021年第8期171-175,共5页Urban Mass Transit

摘　　要：随着地铁线网的不断加密,外部作业活动与地铁结构之间的关系越发紧密,尤其是位于地铁隧道结构正上方的外部作业活动在实施阶段和使用阶段对地铁隧道结构安全和正常运营会产生较大影响。因此,科学合理的外部作业设计方案是保证地铁隧道结构运营安全的关键。以市政高架桥上跨地铁隧道结构为工程背景,通过建立三维数值计算模型,分析市政高架桥扩大基础方案、桩基方案在实施阶段和运营阶段对下部地铁隧道结构产生的影响。计算结果表明:上跨地铁隧道结构的市政工程应尽量采用跨越地铁隧道结构的形式,将其荷载传递到地铁隧道结构两侧,确保地铁隧道结构变形在规范允许范围内;当市政工程基础与地铁隧道结构竖向净距较大时,可采用扩大基础方案,但应保证作用在地铁隧道结构上的附加应力满足相应规范要求。With densification of metro line network,relationship between external operation activities and metro structure is growing ever-connected,especially considering the significant impact that external operation activities directly above metro tunnel structure exerts on structural safety and normal operation during construction and operation stage.Therefore,a scientific and reasonable design scheme of external operation is the key to ensuring metro tunnel structure operation safety.Taking the municipal viaduct over-crossing metro tunnel structure as engineering background,through establishment of three-dimensional numerical calculation model,municipal viaduct foundation expansion scheme is analyzed,as well as the impact of pile foundation scheme on the metro tunnel structure below during construction and operation stage.Calculation results show that the project should use spanning structure from,so that the load is transferred to both sides of metro tunnel structure,keeping structural deformation of tunnel structure within allowable range of specification.When the vertical distance between municipal project foundation and the metro tunnel structure is large enough,foundation expansion scheme can be applied,but the additional stress acting on metro tunnel structure should meet the requirements of relevant specifications.

关 键 词：地铁隧道 市政高架桥 桩基 跨越式结构 数值计算分析 

分 类 号：U443.15[建筑科学—桥梁与隧道工程] U458.1[交通运输工程—道路与铁道工程]