摘要
基于某邻近地铁既有结构的基坑开挖工程,采用Midas/GTS有限元模拟分析了基坑施工过程引起的地铁结构位移及内力的变化情况。结果表明:基坑开挖对邻近地铁结构产生一定影响,主要引起结构水平方向的位移,但影响程度较小,最大水平位移小于规范允许值;基坑开挖引起车站结构的轴力增大约11%,结构剪力和弯矩值增加不明显,同时引起区间结构内力几乎无变化。基坑开挖期间,提出了围护结构选型及参数,并提出了基坑分块、对称开挖、基坑开挖后快速回筑的设计及施工建议,确保了地铁结构受力状态整体处于安全水平,地铁结构的变形满足规范控制要求。
Based on the foundation pit excavation adjacent to an existing subway structure,the Midas/GTS finite element simulation software is used to analyze the changes of the displacement and internal force of the subway structure caused by the foundation pit construction process.The calculation and analysis results show that the excavation of the foundation pit has a certain influence on the adjacent subway structure,mainly causing the horizontal displacement of the structure,but the influence degree is small,the maximum horizontal displacement is less than the allowable value of the code.The axial force of the station structure increases by about 11%due to foundation pit excavation,but the increase of shear force and bending moment is not obvious,and the internal force of the running tunnel structure is almost unchanged.During foundation pit excavation,it proposes the selection scheme and corresponding parameters of retaining structure,and the design and construction suggestions of foundation pit block division,symmetrical excavation,and rapid back-filling after foundation pit excavation,ensuring the stress state of subway structure is at a safe level,and the deformation of subway structure meets the control requirements specified in standard.
作者
于清平
陈志健
YU Qingping;CHEN Zhijian(Foshan Rail Transit Design and Research Institute Co.,Ltd.,Foshan 510000;Foshan Nanhai Branch,Guangzhou Red Sea Hanyang Human Resources Co.,Ltd.,Guangzhou 510000)
出处
《现代隧道技术》
CSCD
北大核心
2022年第S01期502-508,共7页
Modern Tunnelling Technology
关键词
基坑开挖
地铁结构
邻近施工
数值分析
Foundation pit excavation
Subway structure
Adjacent construction
Numerical analysis
