近场双向地震动输入的隧道响应分析  

Response Analysis of Tunnel Under Near-field Bidirectional Ground Motion

作　　者：杨楚凡 王伟 张磊 汪俊诚 YANG Chufan;WANG Wei;ZHANG Lei;WANG Juncheng(College of Civil Engineering and Transportation,Hohai University,Nanjing210098,China;Hubei Provincial Water Resources and Hydropower Planning,Survey and Design Institute,Wuhan 430000,China;Tianjin Rail Transit Network Management Co.,Ltd,Tianjin 300000,China)

机构地区：[1]河海大学土木与交通学院,南京210098 [2]湖北省水利水电规划勘测设计院,武汉430000 [3]天津轨道交通线网管理有限公司,天津300000

出　　处：《兰州交通大学学报》2024年第1期16-23,共8页Journal of Lanzhou Jiaotong University

摘　　要：在近场地震记录中,水平和竖向地震动的加速度都较大,考虑竖向地震动与水平地震动共同作用对隧道响应的影响很有必要。因此通过建立了隧道动力分析的有限元模型,引入了土体的非线性动力本构,选取了20组脉冲地震动及相应进行剔除速度脉冲处理,地震动通过在模型底部输入,得到单向和双向地震动输入的加速度、位移和应力响应,并且对比单、双向的响应分析结果。研究结果表明:双向地震动作用下与单向地震动作用下对隧道结构有一致的规律,即随着PGV的增大,隧道的加速度、位移和应力响应都是增大的;并且FD地震动作用下对隧道的加速度、位移和应力响应大于NP地震动作用下。双向地震动作用下相对于水平地震动作用下对隧道结构有一定的影响:通过竖向地震动输入影响率来表现,加速度响应和应力响应基本都在±5%之内,表明竖向地震动对其影响较小;而位移响应相对敏感,受竖向地震动的影响范围较广,但仍有大部分处于在±5%之内。In near-field seismic records,the acceleration of horizontal and vertical ground motions is large,so it is nec-essary to consider the effect of vertical and horizontal ground motions on tunnel response.Therefore,a finite element model of tunnel dynamic is established which introduces the nonlinear dynamic constitutive of soil mass.By selecting 20 groups of pulse ground motion and the corresponding velocity pulse removal processing which subsequently input at the bottom of the model,theunidirectional and bidirectional acceleration,displacement and stress responses of tun-nel are obtained and compared.The results show that:There is a consistent rule for tunnel structure under bidirec-tional ground motion and unidirectional ground motion,that is,with the increase of PGV,the tunnel acceleration,dis-placement and stress response increase;andthe response of FD ground motion to tunnel acceleration,displacement and stress is greater than that of NP ground motion.The two-way ground motion has a certain influence on the tun-nel structure compared with the horizontal ground motion.The acceleration response and stress response are both within±5%according to the vertical ground motion input influence rate,which indicates that the vertical ground motion has little influence on the tunnel structure.The displacement response is relatively sensitive,and the range of vertical ground motion is wide,but most of them are still within±5%.

关 键 词：脉冲地震动 隧道动力分析 单向和双向地震动 非线性动力本构 影响率 

分 类 号：TU9[建筑科学]