Study the amplication effect of different slope subject to seismic loading

Abstract

The dynamic response and instability mechanisms of slopes under the influence of strong earthquakes have always been crucial areas of research in geological hazards. This study aims to delve into the stability of various types of slopes under seismic conditions. Utilizing the finite difference method, it unveils the dynamic response patterns of different slope types.And using the controlled variable method, this study meticulously analyzed the acceleration, displacement, and dynamic stress response of slopes with different angles, clarifying the impact of slope angle and varying accelerations on slope dynamic responses. The findings are as follows: The Peak Ground Acceleration (PGA) of slopes increases with elevation, reaching its maximum at the slope crest. This coefficient decreases as the slope angle increases, exhibiting a pronounced tendency for acceleration to be more pronounced near the surface. Displacement peaks, particularly sensitive to changes in seismic acceleration within the relative elevation range of 0.6 to 0.8, decrease with an increase in slope angle, especially beyond 60°, at which point the displacement response mechanism undergoes a change. Stress peaks diminish with rising elevation and become more pronounced with increased seismic load, indicating that the upper parts of slopes are more significantly affected by earthquakes. The increase in slope angle shifts stress concentration from the mid-slope towards the toe, particularly under steep slopes, where stress at the slope foot notably increases.