复合地层地铁隧道结构抗震安全评价分析  

Seismic Safety Evaluation and Analysis of Metro Tunnel Structure in Composite Strata

作　　者：田管凤 余新盟 TIAN Guanfeng;YU Xinmeng(School of Environment and Civil Engineering,Dongguan University of Technology,Dongguan 523808,Guangdong,China)

机构地区：[1]东莞理工学院生态环境与建筑工程学院,广东东莞523808

出　　处：《隧道建设（中英文）》2023年第S02期273-280,共8页Tunnel Construction

基　　金：广东省基础与应用基础研究基金项目(2020A1515010560);广东省科技计划项目(2017B030314082);东莞理工学院博士科研启动专项经费项目(GC300502-28)。

摘　　要：为适应地铁工程抗震防灾的要求,对隧道结构进行抗震安全评价分析。首先,基于隧道抗震性能受地质环境、隧道结构、地震力等多因素影响的特点,通过划分地层组段表征复合地层围岩;其次,采用有限元时程分析法计算衬砌的横向弯矩、剪力、轴力以及直径变形率等4项力学性能参数;再次,依据衬砌材料的强度和变形要求,确定以上参数相应的安全因子并将其作为抗震安全单项评价指标;最后,将进一步分析评价指标的抗震敏感值作为权重,得到综合评价系数,从而建立复合地层地铁隧道结构抗震的定量安全评价方法。通过工程应用分析发现:1)相对于衬砌弯矩和轴力,直径变形率和剪力对地震动水平的敏感度更高;2)地层组段的整体刚度越低、地层分布越均匀,则越有利于提高隧道抗震安全性。In order to meet the requirements of earthquake resistance and disaster prevention,seismic safety evaluation and analysis of tunnel structure are conducted.First,based on the characteristics of geological environment,tunnel structure,seismic force,and other factors affecting the tunnel seismic performance,the surrounding rock of composite strata is characterized through dividing strata groups.Second,the finite element time-history analysis method is used to calculate the four mechanical performance parameters of lining,including transverse bending moment,shear force,axial force,and diameter deformation rate.Third,according to the strength and deformation requirements of lining materials,the safety factors corresponding to the above parameters are determined as the single evaluation index of seismic safety.Last,the seismic sensitivity value of the evaluation index is further analyzed as the weight to obtain the comprehensive evaluation coefficient,and a quantitative safety evaluation method for the seismic resistance of metro tunnel structure in composite strata is established.Through analysis on the engineering application,it is found that:(1)The diameter deformation rate and shear force are more sensitive to the seismic force level than the lining bending moment and axial force.(2)The lower the overall stiffness of strata group and the more uniform the strata distribution,the more conducive to the improvement of tunnel seismic safety.

关 键 词：复合地层 隧道结构 抗震安全评价 抗震敏感值 综合评价系数 直径变形率 

分 类 号：U455[建筑科学—桥梁与隧道工程]