地震作用下边坡永久位移分析方法研究

为了了解地震作用下边坡永久位移的变化特点及分布规律，将FLAC3D计算得到的绝对动位移减去山体动位移得出相对动位移，再利用滑动平均法将相对动位移分离出可恢复位移和永久位移。利用该方法对凤凰山边坡工程进行了地震作用下位移分析。通过分析发现边坡永久位移变化曲线存在阈值，当加速度值大于阈值点时永久位移增大，随后趋于稳定，永久位移随时间积累。此外，计算分析所得残余位移分布规律与试验结果较为一致，说明所提方法对边坡动位移的计算和分析是基本合理的。

Study on Analysis Method for Permanent Displacement of Slope under Seismic Action

To understand the change characteristics and the distribution law of permanent displacement of slope under seismic action, first, subtract the dynamic displacement of slope mass from the absolute dynamic displacement calculated by FLAC3D to get the related dynamic displacement; second, by sliding average method, separate the related dynamic displacement into the recoverable and permanent displacement. For the Fenghuangshan Slope engineering, the displacement analysis of slope under seismic action was carried out by this method. Through this analysis, it was found that there exists threshold valve on the change curve of permanent displacement and, when the acceleration magnitude is larger than the threshold valve, the permanent value increases and then became stable, and it will accumulated as time goes by. Furthermore, the distribution law of residual displacement obtained by calculation, which is consistent with the test result, shows that the calculation and analysis on the dynamic displacement of slope by the method mentioned herein is reasonable substantially.