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以大岗山水电站大型地下洞室为例,分别构建了地下洞室体系简化模型和考虑山体地形与不利地质结构的复杂模型,利用显式有限差分方法分析了山体地形和大型地质结构面对洞室围岩地震响应的影响,研究地下洞室地震变形规律及响应特征。研究表明:山形地表的反射波主要表现为P波作用,地质结构面的反射、折射波主要表现为S波作用;山体地形对地下洞室上部迎波面的地震响应影响要大于下部,且上部围岩的位移与加速度响应均有一定程度的放大。地质结构面对于边墙部位洞周岩体的地震变形幅值有较大影响,对围岩加速度的放大效应也比较显著,但主要集中在距离结构面分布位置较近的有限范围内,并且地质结构面对不同频率成分的地震波的影响规律不同。
Taking the large-scale underground caverns at Dagangshan Hydropower Station as an example, a simplified model of underground caverns and a complicated model considering mountain topography and unfavorable geologic structure are respectively constructed. By using the explicit finite difference method, The influence of the seismic response of the surrounding rock is studied, and the seismic deformation and response characteristics of the underground cavern are studied. The results show that the reflection of the Yamagata surface is mainly reflected by the P wave and the reflection of the geological structure surface, and the refraction wave mainly acts as the S wave. The mountainous terrain has a greater influence on the seismic response of the upper wave-facing surface of the underground cavern than the lower part, Rock displacement and acceleration response have a certain degree of amplification. The geologic structure has a great influence on the amplitude of seismic deformation of the rock body around the perimeter of the side wall, and also has a significant amplification effect on the acceleration of surrounding rock. However, the geological structure mainly concentrates within a limited range close to the distribution of the structural plane, The influence of the structure on the seismic waves with different frequency components is different.