摘要
以深圳地区某南北双向紧贴地铁站的深大基坑工程为实例,针对该工程周边环境复杂,基坑开挖面积超大,开挖深度超深,基坑内支撑体系复杂等特点,在设计阶段运用MIDAS/GTS建立基坑-地铁车站-区间隧道的三维有限元数值分析模型,通过施工阶段分析,模拟了施工过程中开挖卸载引起的支护结构及相邻土体的位移,分析验证了支护结构体系的安全性,并评估了基坑开挖过程对地铁车站及区间隧道的影响。通过数值分析找出支护结构及周边地铁设施的薄弱环节,并提出针对性的设计加强措施,确保支护与紧邻地铁设施的安全。实测数据表明,基坑支护结构在基坑开挖施工、运营期间处于稳定状态。
Taking a north-south two-way project close to the subway station in Shenzhen as an example,in view of the complex surrounding environment,large excavation area,ultra-deep excavation depth,and complex support system in the foundation pit,MIDAS/GTS was used to establish a three-dimensional finite element numerical analysis model of foundation pit-subway station and section tunnel in the design stage,and the displacement of the supporting structure and adjacent soil caused by excavation and unloading during the construction process was simulated through the analysis of the construction stage,and the safety of the supporting structure system was verified by analysis.The impact of excavation on subway stations and section tunnels was also evaluated.Through numerical analysis,the weak links of the supporting structure and surrounding subway facilities were identified,and targeted design strengthening measures were proposed to ensure the safety of supporting and adjacent subway facilities.The measured data show that the foundation pit support structure is in a stable state during the excavation construction and operation of the foundation pit.
作者
吕志刚
陈俊生
杨剑维
邹恩葵
王燕燕
刘晨
LÜZhigang;CHEN Junsheng;YANG Jianwei;ZOU Enkui;WANG Yanyan;LIU Chen(Guangdong Urban&Rural Planning and Design Institute Co.,Ltd.,Guangzhou 510220,China;State Key Laboratory of Subtropical Building Science,School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China;South China Institute of Geotechnical Engineering,Guangzhou 510640,China;Shenzhen Geotechnical Investigation&Surveying Institute Co.,Ltd.,Shenzhen 518028,China)
出处
《建筑结构》
北大核心
2023年第23期116-123,93,共9页
Building Structure
关键词
深大基坑
内支撑
地铁车站与区间隧道
三维有限元数值分析
deep and large foundation pit
internal support
subway station and section tunnel
three-dimensional finite element numerical analysis
