Seismic Response Characteristics of Complex Slope Terrain Based on FLAC3D Numerical Simulation

In the southwestern region of China, there are many natural slopes due to various factors such as terrain and landforms. Additionally, a large number of engineering projects are constructed in this region. When constructing highways, it is inevitable to build numerous cut slopes. Unfortunately, the seismic belt of China is mainly distributed in the southwestern region. Therefore, studying the dynamic response of cut slopes under seismic excitation is particularly important to reduce the occurrence of natural disasters such as landslides. This study utilizes numerical simulation methods to investigate the stability of different cut slopes. The results indicate that the acceleration dynamic response and displacement dynamic response exhibit elevation amplification effects. In the case of stepped cut slopes, the acceleration on the outer side of the steps is greater than that on the inner side, and the displacement on the outer side is larger as well. Additionally, the stress on the outer side is smaller compared to the inner side. As the platform width increases, the acceleration on the outer side decreases while the inner side accelerates. Similarly, the displacement on the outer side decreases while it increases on the inner side. Furthermore, the stress on the outer side increases while it decreases on the inner side. Consequently, as the slope angle of the slopes increases, the stability of the slopes deteriorates. Conversely, as the platform width increases, the stability of the slopes improves. The findings of this study can provide guidance for the construction and reinforcement of slope engineering, especially in the context of stepped slopes.