摘要
填海区经常会出现大型基坑群的开挖施工,相邻基坑施工的影响性不可忽视。本文以港珠澳大桥澳门口岸基坑群工程为研究对象,采用Midas/GTS建立三维数值分析模型,通过对比单个基坑开挖工况和基坑群分期开挖工况,分析大型基坑群分期开挖对相邻基坑的影响性。结果表明,大型基坑群分期开挖将改变邻近基坑围护结构的侧向位移形态,引起邻近基坑整体向施工区移动。同时大型基坑群分期开挖将引起基坑间土体的应力释放,改变土体刚度,使得邻近基坑的支撑轴力分布在水平面上表现出较强的非对称性。先开挖基坑在靠近后开挖基坑一侧的围护结构对于基坑深度和间距等因素的改变较远离后开挖基坑的围护结构更为敏感。
Excavation of large foundation pits often occurs in reclamation areas,and the influence of adjacent foundation pit construction can not be ignored.In this paper,a three-dimensional model was built using Midas/GTS,based on Hong Kong-Zhuhai-Macao Bridge Macao Port Project.Then the influence of adjacent foundation pit excavation was analyzed by comparing the excavation conditions of a single foundation pit and the excavation conditions of the foundation pit group.The results show that the large-scale foundation pit excavation will change the displacement of the adjacent foundation pit retaining structure,causing the adjacent foundation pit to move toward the construction area.Besides,a strong asymmetry of supporting axial force is found,which is caused by the stress release and stiffness change of the soil between adjacent foundation pits under the staged excavation of large-scale foundation pit group.The excavation support structure changes significantly close to the excavating pit because of the depth and spacing of the foundation pit factors.
作者
林楠
刘发前
Lin Nan;Liu Faqian(Shanghai Municipal Engineering Design Institute(Group)Limited Company,Shanghai 200092,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2019年第S01期278-285,共8页
Chinese Journal of Underground Space and Engineering
基金
上海市政工程设计研究总院(集团)有限公司支持课题.
关键词
填海区
相邻基坑
分期开挖
数值模拟
reclamation area
adjacent foundation pit
staged excavation
numerical simulation
作者简介
林楠(1993—),男,福建仙游人,硕士,主要从事岩土工程、地下工程设计与科研工作。E-mail:linnan@smedi.com;通讯作者:刘发前(1981—),男,安徽寿县人,博士,高级工程师,主要从事岩土工程、地下工程设计与科研工作。E-mail:liufaqian@smedi.com
