Abstract:Earthquakes are very likely to produce various geological disasters, and it is very important to study the stability and deformation characteristics of slopes under the action of earthquakes. In this paper, taking a double quarry soil discharge field as the research object, a three-dimensional numerical model of soil discharge field considering different soil discharge materials was established, and numerical simulation of seismic load was carried out on the soil discharge field based on the time course analysis method. The results show that the lateral displacement response of the earth displacement field under seismic loading is more significant, and the displacement response in the direction of gravity is relatively small. The higher the elevation, the more significant the degree of displacement and deformation of the earth displacement area is affected by the earthquake. With the increase of seismic intensity level, the maximum displacement at different characteristic points is larger, showing a better linear relationship. The higher the seismic intensity level, it will have a greater impact on the overall stability of the slope, such as the minimum factor of safety is less than the normative value may lead to sliding of the slope. The amplitude of seismic load increases, the overall PGA amplification factor shows free surface amplification effect, and with the increase of slope elevation, the amplification effect has a certain attenuation trend. The seismic frequency is easy to trigger resonance phenomenon near the intrinsic frequency of the slope, which leads to a significant increase in the PGA amplification factor, and the gain effect of the slope elevation on the PGA value is more obvious at this frequency.