为研究上下双层隧道穿越滑坡体的地震动力响应，开展相似比为1∶100的振动台试验，并采用动应变及加速度2个参量分别对隧道衬砌及围岩的动力响应进行分析，在此基础上采用快速傅里叶变换和小波包对频谱响应进行探讨。研究结果表明： 1）上下双层隧道衬砌结构对于地震波的敏感程度不同，衬砌外表面的应变响应主要出现在右拱腰和左拱脚；上层隧道衬砌内表面的破坏主要出现在左拱腰，下层隧道主要出现在右拱腰；隧道衬砌内外表面受力不同，极易引发衬砌损伤破坏。2）在输入较大地震动（0.3g~0.6g）时，上层隧道结构对地震波有一定的放大作用，各测点加速度沿高程方向具有明显的放大效应；同时，上层隧道拱顶及仰拱的加速度响应均大于下层隧道，在抗震设计过程中应将上层隧道作为重点关注对象。3）影响隧道拱顶和仰拱的主要为第1—2频带（0.20～12.52 Hz）的地震波，25.02 Hz以上的地震波对上下双层隧道的影响较小；上层隧道和下层隧道的频带能量分布也具有明显的差异性。

To study the seismic dynamic response of overlapped tunnels crossing through landslide body, a 1∶100 vibration platform test is conducted. The dynamic strain and acceleration are used to evaluate the dynamic response of tunnel lining and analyze the dynamic response of surrounding rock respectively, and then the fast Fourier transform and wavelet packet are used to discuss the spectrum response. The results show the following: (1) The sensitivities of the overlapped tunnels′ lining structures to the seismic waves vary. The strain response of the outer surface of the tunnel lining mainly occurrs at the right arch waist and left arch foot. However, the damage of the inner surface of the upper tunnel lining is mainly in the left arch waist, while the damage of the lower tunnel lining is mainly in the right arch waist. The stresses on the inner and outer surfaces of tunnel lining vary, which will easily induce lining damage. (2) The upper tunnel structure has a certain amplification effect on the seismic wave when the ground motion input is large (0.3g~0.6g), and the acceleration response of each measuring point has an obvious amplification effect along the elevation direction. Furthermore, the acceleration response of the crown and invert of the upper tunnel is greater than that of the lower tunnel, indicating that the upper tunnel should be the focus of attention in the process of earthquake resistant design. (3) The crown and invert of the tunnels are mainly affected by the seismic waves in the 1st2nd frequency band (0.20~12.52 Hz), while the seismic waves above 25.02 Hz have little impact on the overlapped tunnels. Additionally, the band energy distribution characteristics of the upper and lower tunnels are significantly different.