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基于粘弹性边界的时域波动理论,建立了二维平面SV波斜入射的输入方法.以成兰铁路某山岭隧道浅埋偏压段为研究对象,采用ANSYS研究了地震波入射角度对浅埋偏压隧道地震反应的影响.结果表明:地震波斜入射时,隧道结构的地震响应与垂直入射有明显差异,结构反应随着入射角度的增加而增大,斜入射对隧道竖向地震响应影响更为显著.入射角度对衬砌弯矩峰值包络图影响较大,对轴力峰值包络图影响很小.斜入射时,拱顶、仰拱和拱腰的弯矩增加较多,是隧道衬砌抗震的薄弱部位.
Based on the time-domain wave theory of viscoelastic boundary, an input method of two-dimensional plane SV wave oblique incidence is established. Taking the shallow buried bias section of a mountain tunnel in the Chenglan Railway as the research object, the influence of seismic wave incident angle on shallow buried partial The results show that when the seismic wave is obliquely incident, the seismic response of the tunnel structure is obviously different from that of the normal incidence. The structural response increases with the increase of incident angle, and the influence of oblique incidence on the vertical seismic response of the tunnel is more The angle of incidence has a great influence on the peak envelope of lining moment and has little effect on the peak envelope of the axial force.When the incident angle is relatively large, the bending moment of vault, Weak parts.