Seismic response of tunnels with damping layer under oblique incident SV waves
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.
万方数据
维普
