For the prevention and mitigation of hazards, it is crucial to quantitatively analyze the seismic response of rock slopes. However, only a few studies have quantitatively analyzed the seismic response of rock slopes; these studies have considered topographic effects only and have neglected geological site effects, such as impedance contrasts and fractures, which are important factors affecting the seismic response of rock slopes, as revealed by multiple recent phenomena. Therefore, this study primarily aims to investigate the possibility of employing a numerical model for quantitatively analyzing the seismic response of rock slopes by considering the geological site effects. Herein, a discrete element method, i.e., discontinuous deformation analysis (DDA), was employed for the dynamic analyses, and a well-monitored rock slope, Mount Dong, was selected as the case study. In the proposed DDA model, horizontal and vertical ground motions were applied simultaneously. The different weathering degrees of the Mount Dong rock layers were considered to reflect the impedance contrasts, and the penalty value at the fractures was altered according to the stiffness for reflecting the fracture effects. Furthermore, a set of optimal boundary settings, especially for DDA, were applied to handle seismic dynamic problems. Results show that DDA can quantitatively reflect the seismic response of Mount Dong along a single direction, such as the horizontal direction, which is sufficient to satisfy engineering requirements. The peak ground acceleration amplification analyses indicate that: 1) a strong impedance contrast is more important than topographic effects for the seismic response of Mount Dong; and 2) in addition to the impedance of rock layers, widely spread fractures also play an important role in contributing to the seismic response anisotropy of rock slopes. Finally, spectral amplification analyses reveal that the responses of the inner and surface portion of Mount Dong are significant in a low- and high-frequency range, respectively.

为了预防和减轻危险，定量分析岩质边坡的地震响应至关重要。但是，只有很少的研究定量地分析了岩质边坡的地震反应。这些研究仅考虑了地形影响，而忽略了地质现场影响，例如阻抗对比和裂缝，这是影响岩质边坡地震反应的重要因素，最近的多种现象表明。因此，本研究的主要目的是通过考虑地质部位效应，探讨采用数值模型定量分析岩质边坡地震响应的可能性。此处，采用离散单元法，即不连续变形分析（DDA）进行动力分析，并采用监测良好的岩石边坡Dong Mount，被选为案例研究。在提出的DDA模型中，同时应用了水平和垂直地震动。考虑到董山岩层的不同风化程度可以反映出阻抗对比，并根据刚度改变裂缝处的罚分值以反映裂缝的影响。此外，还应用了一组最佳边界设置，尤其是DDA的最佳边界设置来处理地震动力学问题。结果表明，DDA可以定量反映出董山在单个方向（例如水平方向）上的地震响应，足以满足工程要求。峰值地面加速度放大分析表明：1）对于东山的地震反应，强大的阻抗对比比地形影响更为重要；2）除了岩石层的阻抗外，广泛分布的裂缝在促进岩石边坡的地震反应各向异性方面也起着重要作用。最后，频谱放大分析显示，董山的内部和表面部分的响应分别在低频和高频范围内很显着。