坑中坑型深基坑施工对邻近地铁隧道影响分析  

Analysis of influence of pit-in-pit pattern deep foundation pit construction on adjacent subway tunnels

作　　者：柳云 杨孝博 谢林杆 蒋军平 郭威 朱轶峰 Liu Yun;Yang Xiaobo;Xie Lingan;Jiang Junping;Guo Wei;Zhu Yifeng(Hunan Construction Engineering Group Co.,Ltd.,Changsha Hunan 410003,China;Hunan Construction Investment Real Estate Group,Changsha Hunan 410003,China)

机构地区：[1]湖南建工集团有限公司,湖南长沙410003 [2]湖南建投地产集团有限公司,湖南长沙410003

出　　处：《山西建筑》2024年第10期85-88,104,共5页Shanxi Architecture

摘　　要：紧邻既有地铁隧道进行深基坑开挖施工将对地铁隧道及运营安全产生影响,以紧邻长沙市地铁2号线已运营隧道区间的某深基坑工程为研究对象,通过划分不同施工工况,利用有限元数值软件Midas/GTS对基坑开挖卸荷阶段的基坑支护结构与隧道变形进行模拟分析。计算结果表明,基坑开挖对既有盾构隧道不利影响主要表现在水平位移、竖向隆起,竖向隆起变化量大于水平位移变化量,数据均在变形控制标准最大限值内,根据结果对支护结构优化,可确保既有地铁隧道安全。The construction of deep foundation pit close to the existing subway tunnel will have an impact on the safety of subway tunnel and operation.Taking a deep foundation pit project close to the operating tunnel section of Changsha Metro Line 2 as the research object,by dividing different construction conditions.The finite element numerical software Midas/GTS is used to simulate the foundation pit supporting structure and tunnel deformation during excavation and unloading stage.The calculation results show that the adverse effects of foundation pit excavation on the existing shield tunnel are mainly in the horizontal displacement and vertical uplift,the change of vertical uplift is greater than that of horizontal displacement,and the data are all within the maximum limit of the deformation control standard.According to the results,the support structure optimization can ensure the safety of the existing subway tunnel.

关 键 词：深基坑 地铁隧道 坑中坑 数值模拟 

分 类 号：TU753[建筑科学—建筑技术科学]