深基坑开挖对下卧地铁车站的影响规律  

Study on Influence Law of Deep Foundation Pit Excavation on Underlying Subway Station

作　　者：王海涛[1] 赵之皓 张嘉树 张志伟 WANG Haitao;ZHAO Zhihao;ZHANG Jiashu;ZHANG Zhiwei(School of Transportation Engineering,Dalian Jiaotong University,Dalian 116028,China;China Railway No.14 Group Corporation Tunnel Engineering Co.,Ltd.,Jinan 250002,China)

机构地区：[1]大连交通大学交通工程学院,辽宁大连116028 [2]中铁十四局隧道集团有限公司,山东济南250002

出　　处：《大连交通大学学报》2025年第1期78-86,共9页Journal of Dalian Jiaotong University

基　　金：辽宁省自然科学基金计划项目(2020-MS-271);辽宁省教育厅科学研究项目(JDL2020014);中铁十四局集团科技研究开发计划项目(2020QT03)。

摘　　要：为了分析深基坑开挖对下卧地铁车站的影响规律,以北京地铁6号线西延线苹果园站三层段工程为依托,利用Midas GTS NX软件对基坑开挖过程中下卧地铁车站和基坑围护结构的变形特征进行研究和分析,并与现场监测数据进行对比。研究结果表明:受基坑开挖卸荷影响,下卧地铁车站沿横向、纵向均发生差异变形隆起,车站拱顶隆起变形最大值为8.20mm;围护结构处车站纵向隆起曲线斜率达到最值后继而沿坑内方向衰减,同一截面内,地铁车站中跨顶板变形>钢管柱变形>边跨顶板变形>边墙变形;无根桩的桩脚与车站顶板连接,变形受车站结构约束,同时短边效应使无根桩整体变形小于有根桩;实测数据与数值模拟的结果具有较好的拟合性,可为类似大刚度地铁车站扩建工程提供参考依据及工程经验。In order to clarify the influence of deep foundation pit excavation on the underlying subway station and based on the three-layer project of Pingguoyuan Station on the west extension line of Beijing Metro Line 6,Midas GTS NX software was used to study and analyze the deformation characteristics of the subway station and the retaining structure of the foundation pit during the excavation of the foundation pit,and the field monitoring data were compared.The results show that due to the unloading effect of foundation pit excavation,the differential deformation and uplift of the underlying subway station occur along the transverse and longitudinal directions,and the maximum uplift deformation of the station vault is 8.20 mm.The slope of the longitudinal uplift curve of the station at the retaining structure reaches the maximum value and then decays along the direction of the pit.In the same section,the structural deformation of the subway station from large to small is the middle span roof,steel pipe column,side span roof and side wall.The foot of the rootless pile relates to the roof of the station,and the station structure constrains the deformation.At the same time,the short side effect makes the overall deformation of the rootless pile smaller than that of the manual digging pile.The measured data are in good agreement with the numerical simulation results,which can provide reference and engineering experience for similar large stiffness subway station expansion projects.

关 键 词：地铁车站 扩建增层 MidasGTSNX 无根桩 现场监测 

分 类 号：TU7[建筑科学—建筑技术科学]