摘要
对于距离隧道较远的浅源地震,地震波是以一定角度倾斜传播到隧道近场并对隧道造成破坏。本文采用有限元方法研究了SV波入射角和减震层对隧道地震响应的影响。利用黏弹性人工边界和等效节点力公式建立了二维斜入射SV波的输入方法,并通过算例验证了该方法的准确性。基于所建立的输入方法,研究了有和无减震层隧道在不同入射角下的地震响应,并分析了减震层环向长度的影响。数值结果表明:1)二次衬砌的拉伸损伤和内力峰值随着入射角的增大而增大;2)减震层在不同的地震波入射角下具有良好的减震效果,减震效果随着入射角的增大而减小,且减震层可以减小二次衬砌的竖向加速度分量;3)减震层的环向长度会影响隧道的减震效果。
For shallow earthquakes far away from the tunnel,the seismic wave propagates obliquely to the near field of the tunnel at a certain angle and cause damage to the tunnel.In this study,the influence of incident angle of SV wave and damping layer on the seismic response of tunnels is studied by the finite element method.The input method of two-dimensional oblique incident SV wave is established by using viscoelastic artificial boundary and equivalent nodal force formula,and the accuracy of the method is verified by an example.Based on the established input method,the seismic responses of tunnels with and without damping layers at different incident angles are studied,and the influence of the circumferential length of the damping layer is analyzed.The numerical results show that:1)The tensile damage and peak internal force of the secondary lining increase with the increase of the incident angle;2)The damping layer has a good damping effect under different incident angles of seismic waves,the damping effect decreases with the increase of the incident angle,and the damping layer can reduce the vertical acceleration component of the secondary lining;3)The circumferential length of the damping layer will affect the damping effect of the tunnel.
作者
周同来
董长松
李爽
樊少勇
ZHOU Tonglai;DONG Changsong;LI Shuang;FAN Shaoyong(Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education,Harbin Institute of Technology,Harbin 150090,China;Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology,Harbin Institute of Technology,Harbin 150090,China;National Key Laboratory of Green and Long-Life Road Engineering in Extreme Environment,CCCC First Highway Survey and Design Institute Co.,Ltd.,Xi’an 710065,China)
出处
《世界地震工程》
北大核心
2024年第1期1-12,共12页
World Earthquake Engineering
基金
西藏自治区重点研发与转化计划项目(子课题)
高寒高海拔地区公路隧道建设与运营关键技术研究(XZ201801-GB-07)。
关键词
隧道
SV波
入射角
减震层
地震响应
tunnel
SV wave
incident angle
damping layer
seismic response
