The Dynamic Response Characteristics of the Slopes with Different Slope Morphology Under the Seismic Wave Action

The seismic landslides are common natural hazards in the mountainous areas, and they can cause a large number of casualties and property losses directly. The dynamic response characteristics of slope under the action of the seismic wave are the primary problem in evaluating the slope seismic stability. In this paper, the research is carried out on the effects of slope angle, morphology, and seismic wave frequency on the slope dynamic responses. Firstly, the slopes with different shapes (straight, concave, and convex slopes) are modeled. Secondly, the slope acceleration amplification factors and shear strain increment are investigated and analyzed. Finally, the dynamic response mechanisms are revealed using the ray analysis method. The results show that the acceleration response of each part of the slope is different for different frequencies, and the value of the amplification factor at the slope surface center is greater than that at the slope top. Slope morphology has significant effects on the dynamic response of the slope, and the slope surface centroid amplification factors change with different slope morphology. Slope angle has prominent impacts on the slope dynamic responses; the amplification factor is greatest at the slope angle of 30°. This study deepens the understanding of the slope seismic dynamic responses, which is vital for predicting slope instability and disaster reduction.