基坑工程对临近既有地铁隧道安全性影响分析  

THE SAFETY INFLUENCE CAUSED BY A FOUNDATION PIT ENGINEERING NEARBY THE EXISTING SUBWAY TUNNELS

作　　者：杨军 陈炎 程晏[1,2] 赵华伟 YANG Jun;CHEN Yan;CHENG Yan;ZHAO HuaWei(Technology Innovation Research Institute branch of Bejjing Metro Operation Co,Lud.Beijing 10044 China;Beijing Key Laboratory of subway-operation-security technology,Beijing 10044,China)

机构地区：[1]北京市地铁运营有限公司技术创新研究院分公司,北京100044 [2]地铁运营安全保障技术北京市重点实验室,北京100044

出　　处：《低温建筑技术》2022年第6期87-91,共5页Low Temperature Architecture Technology

摘　　要：文中以既有工程案例为研究对象.依托有限元数值工具为研究手段.进行计算分析,研究大型基坑在开挖施工过程中,引起的周边边坡土体变形,对临近既有地铁区间隧道的安全性影响.通过对基坑围护结构及支护体系设置加强措施.以形成对地铁结构具有针对性保护,计算分析加固后的变形控制效果,结果显示采用钻孔灌注桩+三轴搅拌桩+预应力装配式内支撑的联合支护体系,能够在一定程度上有效控制基坑开挖引起的变形量,达到保护地铁隧道结构安全的目的。On the basis of the existing practical engineering cases and with the help of the finite element numerical analysis tools, this paper studies the unloading process of large foundation pit excavation and the influence of surrounding soil deformation on the safety of nearby metro tunnels. Through strengthening the retaining structure and support system of foundation pit, it forms the effective protection of the metro tunnels.The protective effect of reinforcement is calculated and analyzed.The results show that the support system of bored pile, triaxial mixing pile, and prestressed prefabricated internal support can effectively control the deformation caused by foundation pit excavation to a certain extent and achieve the purpose of subway tunnel protection.

关 键 词：基坑工程 地铁区间隧道 有限元计算分析 安全保护措施 

分 类 号：TU473.2[建筑科学—结构工程]