考虑边坡地形效应的地震动力响应分析

Dynamic Response Analysis of Seismic Slopes Considering Topographic Effect

摘要:

地震滑坡往往会造成巨大的人员伤亡和财产损失，而边坡在地震作用下的响应规律是研究地震边坡稳定性的首要问题。本研究利用FLAC^3D有限差分软件建立多个边坡模型，进行边坡地形效应的地震动力响应分析，考虑的地形主要包括坡高、坡角、坡面形状等三方面的因素。将选取的地震波作用于不同模型，分析坡面加速度、速度放大比及坡顶坡脚傅里叶谱值，研究边坡几何形态对边坡地震响应的影响。结果表明，坡高对坡面的速度放大影响明显，坡角对坡面加速度放大效果较强，而不同的坡面形状会造成不同的加速度响应规律，凹面坡加速度放大效果更小一些。该研究有助于地震边坡的稳定性分析并为边坡工程的抗震设计提供参考。

Abstract:

Seismic landslide often causes casualties and property losses, and the response law of slopes under the action of earthquake is significant for studying the stability of seismic slopes. In this work, finite difference software FLAC^3D was used to build multiple models for analyzing the seismic dynamic response of slope considering the topography effect. The topography was mainly considered in three aspects, namely, slope height, slope angle, and slope shape. The selected seismic waves were applied to different models to analyze the slope acceleration and velocity amplification ratio. The influence of the geometry of the slope on its seismic response was also determined. Results show that the slope height has a significant amplification effect on the speed of the slope. The slope angle has a strong amplification effect on the acceleration of the slope. Different slope shapes will cause different acceleration response laws. This study is helpful for stability analysis of seismic slopes and provides reference for seismic design of slope engineering.