基坑开挖对邻近既有隧道变形的影响  

Influence of Foundation Pit Excavation on Deformation of Adjacent Existing Tunnels

作　　者：李顺群 马伟亮[1,2] 叶茂松 黄雄飞[3] 张彦[1,2] LI Shunqun;MA Weiliang;YE Maosong;HUANG Xiongfei;ZHANG Yan(School of Civil Engineering,Tianjin Chengjian University,Tianjin 300384,China;Tianjin Key Laboratory of Soft Soil Properties and Engineering Environment,Tianjin Chengjian University,Tianjin 300384,China;Anhui Shuian Construction Group Co.,Ltd.,Hefei 230601,Anhui,China)

机构地区：[1]天津城建大学土木工程学院,天津300384 [2]天津城建大学天津市软土特性与工程环境重点实验室,天津300384 [3]安徽水安建设集团股份有限公司,安徽合肥230601

出　　处：《济南大学学报（自然科学版）》2022年第3期252-260,共9页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(41877251);天津市科技支撑重点项目(19YFZCSF00820);中国交建岩土工程重点实验室开放课题(2019-KJ-Y-01)。

摘　　要：以某深基坑项目为例,利用小应变硬化模型对基坑开挖全过程进行模拟计算,结合坑外土体三维应力和隧道位移监测结果,研究基坑开挖对邻近既有隧道变形的影响。结果表明:土体三维应力和隧道变形计算结果与实测数据基本吻合,说明了计算模型的可靠性;基坑开挖引起围护结构向基坑方向最大偏移量为25.8 mm,引起邻近基坑地表最大沉降量为17.7 mm;基坑开挖引起左线隧道向基坑方向最大水平位移约为2.3 mm,向深度方向最大位移约为1.3 mm,与实测值基本吻合,符合规范要求;左线隧道管片最大轴力约为680 kN,最大弯矩约为58 kN·m,隧道砌筑管片能够满足强度要求;基坑外不同位置的隧道在基坑开挖期间均向基坑方向偏移,竖向位移表现为上浮。Taking a deep foundation pit project as an example,whole process of foundation pit excavation was simulated by using small deformation hardening model.Combined with three-dimensional stress of soil outside the pit and monitoring results of tunnel displacement,influence of foundation pit excavation on adjacent existing tunnels was researched.The results show that the calculated results of three-dimensional stress of soil and tunnel deformation are in good agreement with measured data,which indicates reliability of the model.The maximum offset of retaining structure towards the foundation pit caused by foundation pit excavation is 25.8 mm,and the maximum surface settlement of adjacent foundation pits is 17.7 mm.The maximum offset of the left line tunnel towards the foundation pit caused by foundation pit excavation is 2.3 mm,and the maximum offset towards the depth direction is 1.3 mm,which are basically consistent with the mea-sured values and meet the requirements of the code.The maximum axial force and bending moment of the left line tunnel segments are respectively about 680 kN and 58 kN·m,and the tunnel masonry segments can meet the strength requirements.Tunnels at different positions outside the foundation pit all deviate to the foundation pit direction during excavation,and vertical displacement is upward floating.

关 键 词：基坑开挖 三维应力 数值模拟 地铁隧道 隧道变形 

分 类 号：TU431[建筑科学—岩土工程]