摘要
为研究基坑分区开挖对邻近越江隧道保护的有效性,以上海市西藏南路双线越江隧道附近绿谷一期基坑工程为依托,首先采用有限元法建立数值模型,分析基坑分区与不分区开挖对地下连续墙位移和既有越江隧道收敛变形的影响。然后根据现场监测数据,研究基坑分区开挖下既有越江隧道和地下连续墙的变形规律。结果表明:1)采用分区开挖的方式,地下连续墙最大位移减小23. 9%,邻近越江隧道最大竖向位移减小35. 4%,分区开挖施工对距离较近隧道的保护效果更好; 2)对于面积较大的分区,其开挖导致的地下连续墙变形更大; 3)既有越江隧道在基坑施工过程中发生了斜向压扁的不规则收敛变形,地下连续墙最大水平位移对邻近隧道的收敛变形具有一定的预测作用。
The protection effect of the division excavation of foundation pit on adjacent river-crossing tunnel is studied by taking the foundation pit of Lyugu Phase 1 Project adjacent to double-track river-crossing tunnel on South Tibet Road in Shanghai for example.Firstly,the influence of division excavation and nondivision excavation of foundation pit on displacement of underground diaphragm wall and convergence deformation of the existing river-crossing tunnel is studied by finite element method.And then,the deformation rules of the existing river-crossing tunnel and underground diaphragm wall under division excavation of foundation pit are analyzed based on site monitoring data.The study results show that:(1)The maximum horizontal displacement of underground diaphragm wall is reduced by 23.9%and the maximum vertical displacement of the river-crossing tunnel is reduced by 35.4%by adopting division excavation for foundation pit;and the protection effect of division excavation of foundation pit on tunnel closed to the foundation pit is better than that away from foundation pit.(2)The deformation of underground diaphragm wall increases with the growth of division area of foundation pit.(3)Oblique irregular deformation of river-crossing tunnel occurs during foundation pit construction,and the deformation of the adjacent river-crossing tunnel can be predicted based on the maximum horizontal displacement of underground diaphragm wall.
作者
张治国
奚晓广
吴玲
ZHANG Zhiguo;XI Xiaoguang;WU Ling(School of Environment and Architecture,University of Shanghai for Science and Technology, Shanghai 200093,China;Engineering Research Center of Rock-Soil Drilling&Excavation and Protection, Ministry of Education,Wuhan 430074,Hubei,China;Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin University of Technology,Guilin 541004,Guangxi,China;The Second Construction Co.,Ltd.of China Construction Third Engineering Bureau,Wuhan 430074,Hubei,China)
出处
《隧道建设（中英文）》
北大核心
2018年第9期1480-1488,共9页
Tunnel Construction
基金
国家自然科学基金项目(41772331)
岩土钻掘与防护教育部工程研究中心课题(201705)
广西岩土力学与工程重点实验室资助课题(15-KF-07)
关键词
基坑分区开挖
越江隧道
数值模拟
现场监测
收敛变形
地下连续墙
division excavation of foundation pit
river-crossing tunnel
numerical simulation
site monitoring
convergence deformation
underground diaphragm wall
