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基于显式有限元方法并结合黏弹性人工边界条件,推导了SV波斜入射时人工边界面上等效节点力的计算公式,并基于通用有限元软件实现了SV波的倾斜输入。采用简单算例验证了SV波斜入射输入方法的准确性。分别考虑了SV波在隧道横断面和纵断面内斜入射工况,研究了SV波斜入射条件下岩体隧道洞身段地震响应规律。计算结果表明:SV波斜入射时的隧道地震响应规律与垂直入射时具有较大的差异;SV波在不同断面内斜入射时隧道的地震响应结果也具有较大差别。
Based on the explicit finite element method and the viscoelastic artificial boundary conditions, the calculation formulas of equivalent nodal forces on the artificial boundary surface are deduced when the SV waves are obliquely incident. The tilted input of SV waves is realized based on the general finite element software. A simple example is used to verify the accuracy of SV wave oblique incident input method. Considering the oblique incidence of SV wave in the tunnel cross section and longitudinal section respectively, the seismic response law of tunnel body tunnel section under the condition of SV wave oblique incidence is studied. The calculated results show that the seismic response of tunnel with SV wave is larger than that with vertical incidence, and the seismic response of SV waves with different oblique incidence is also different.