地震动特性对黄土斜坡稳定性的影响分析

ANALYSIS ON INFLUENCE OF EARTHQUAKE MOTION TO LOESS SLOPE INSTABILITY

摘要:

采用弹塑性动力有限元分析方法和Drucker-Prager屈服准则,将基于现行抗震设计规范中的Ⅰ、Ⅲ类场地标准反应谱曲线拟合而成的地震动时程作为地震输入,选取黄土地区典型滑坡类型进行分析计算。通过对不同峰值加速度、频谱、持续时间作用下黄土斜坡的变形破坏特征的分析,展示了土体在地震作用下的动态响应和变化规律,揭示了地震动的工程特性对黄土斜坡稳定性的影响。

Abstract:

Using the theory of elastic-plastic dynamic FEM and the Drucker-Prager yielding criterion, taking the time history of earthquake motion which fitted by the graphs of standard response spectrum on Ⅰ & Ⅲ types of site in the standard of Aseismic Design, as the earthquake input, to a typical loess landslide, in this paper the dynamic analysis and calculate on influence of earthquake motion to loess slope instability are made. The strain characteristics of loess slope in earthquake motion progress in different PGA, Tg and last times are analyzed. The result shows how the earthquake engineering characters influence on the stability of loess slope and displays the dynamic response of soil and change regularity of stress.