Abstract：Considering a circular tunnel embedded in saturated soil, the amplification of site ground motion due to the tunnel is studied by a 2.5D finite elementboundary element coupling method. It is assumed that seismic waves are incident at an arbitrary angle from bedrock, and the incident direction is described by a horizontal angle θhand a vertical angle θv. A parametric investigation on the effects of the incident angle of seismic waves on ground acceleration responses is conducted. It is shown that the amplification factors of the ground accelerations for the oblique incidence case are much larger than those for the vertical incidence case. Moreover, the incident angle also has a big influence on the acceleration response spectra, in terms of the amplitude, distribution pattern and predominant period, and the influence is more pronounced for the vertical acceleration responses. It is also shown that, for the numerical example in this study, when θh< 30° and θv> 30°, the ratios of the amplitudes of the vertical accelerations to those of the horizontal accelerations can be larger than 0.65 which is recommended by the code for seismic design, and the amplitudes of the response spectra for the vertical accelerations may be larger than those for the horizontal accelerations.
朱俊 李小军 梁建文 张斌. 地震波三维斜入射作用下隧道#br#
对场地地表地震动的影响[J]. 土木工程学报, 2020, 53(S1): 318-324.
Zhu Jun Li Xiaojun Liang Jianwen Zhang Bin. Effects of a tunnel on site ground motion for 3D obliquely incident seismic waves. 土木工程学报, 2020, 53(S1): 318-324.
