地铁换乘站深基坑围护结构变形规律FLAC模拟研究  

Research on the Deformation Law of Deep Excavation Supporting Structure in Metro Interchange Station by FLAC Simulation

作　　者：任建喜[1] 高涛[2] 

机构地区：[1]西安科技大学,西安710054 [2]北京城建勘测设计研究院有限责任公司,北京100101

出　　处：《铁道工程学报》2008年第9期80-83,99,共5页Journal of Railway Engineering Society

基　　金：教育部科学技术研究重点项目(207119);陕西省教育厅自然科学专项科研项目(08JK362)

摘　　要：研究目的:以北京奥运支线大屯路地铁换乘站深基坑工程为背景,采用现场监测和FLAC有限差分法模拟计算的方法,研究城市地铁车站深基坑施工过程中的围护结构变形规律,为北京地区地铁深基坑工程的围护结构优化设计和信息化施工提供依据。研究结论:复杂环境下城市地铁换乘站深基坑明挖施工时,现场监测是信息化安全施工的保证,对于形状复杂的车站基坑应该采用围护桩、钢支撑和锚索等组成的复合维护形式作为基坑的围护结构;土方分层开挖方式和钢支撑预应力施加是减少空间效应保证安全施工的重要措施;FLAC数值计算是研究基坑变形规律的重要手段。Research purposes： In the engineering background of deep excavation of Datunlu metro transfer station of Beijing subway olympic branch line, the combination of in - situ monitoring with FLAC simulation is used as the methodology, deformation law of deep excavation supporting structure of city subway station is studied. And it provided a basis for supporting structure optimum design of Beijing metro excavation projects and information construction. Research conclusions： When open excavation construction is carried out in deep excavation of city subway transfer station under complex environment, in - situ monitoring is a useful measure for safety guarantee to information construction. For subway station with complicated shape, compound maintenance forms that it includes retaining pile, steel support and anchor cable should be adopted to be as supporting structure of deep excavation. Stratified excavation method of earthwork and applying prestress to steel support are the important measure of reducing spatial effect and guarantee safe construction. FLAC numerical simulation is important means for the study of deep excavation deformation law.

关 键 词：深基坑 围护结构 变形规律 FLAC模拟 监测 

分 类 号：U231.4[交通运输工程—道路与铁道工程]