既有盾构隧道上方基坑群开挖顺序优化研究  

Research on Optimization Excavation Sequence of Foundation Pit Group Above Existing Shield Tunnels

作　　者：卫军 徐国元[1] 刘启清 WEI Jun;XU Guoyuan;IU Qiqing(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou Guangdong 510641,China;Guangdong Guangzhou-Zhuhai Intercity Rail Transportation Co.Ltd.,Guangzhou Guangdong 510335,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]广东广珠城际轨道交通有限责任公司,广东广州510335

出　　处：《铁道建筑》2018年第8期84-87,共4页Railway Engineering

基　　金：国家自然科学基金(51078151)

摘　　要：以珠海市海琴桥承台基坑群工程为背景,利用MIDAS/GTS有限元软件建立该基坑群工程的三维数值模型并优化基坑开挖顺序,分析4种不同开挖顺序引起的下卧盾构隧道竖向位移与地表沉降。结果表明:最优开挖顺序为3组对称间隔式开挖,能最大程度减小盾构隧道的竖向位移及地表沉降,即第一步开挖面积较大的1#基坑。The group foundation pits of Haiqin bridge in Zhuhai is the engineering background in this paper.The three-dimensional numerical model of group foundation pits was built using MIDAS/GTS f inite element software,and the excavation sequence was optimized.Four different excavation sequences were selected,and the vertical displacement of the underlying shield tunnel and the ground subsidence were analyzed.The results show that best excavation sequence is the spaced symmetrical excavation with three groups,minimizing the vertical displacement of shield tunnel and the ground subsidence.The f irst step is to excavate the No.1 foundation pit with the larger area.

关 键 词：城市桥梁 基坑群开挖 数值分析 盾构隧道 优化设计 

分 类 号：U445.55[建筑科学—桥梁与隧道工程]