Analytic results indicate that the calculation results with simple boundaries is larger than those with viscous boundaries , that it is adequate that the transverse calculation range is taken as six times of the diameter of the tunnel with simple boundaries , that it is accurate enough to analyze the transverse seismic response with planar models , that the seismic response of immersed tunnels increases with the increasement of depth and it is great in hard rock , and that the coupling of water and structures has a little influence on the seismic response of immersed tunnels 分析结果表明，与采用粘性边界相比采用简单边界计算的结果是偏大的；采用简单边界时横向计算范围取六倍洞宽就足够了；在对沉管隧道进行横断面地震分析时采用二维分析就行了。沉管隧道的地震反应随着埋深的增加而增加；在硬岩中沉管隧道的地震反应要大些；水与结构的耦合对沉管隧道的地震反应影响不大。
