论文部分内容阅读
基于小波分析方法,从NGA数据库的3 551条地震记录中选取189条速度脉冲地震动,地震动均转换成发生最强脉冲的方向。基于Newmark方法,分析了近断层速度脉冲地震动作用引起的边坡永久位移值。结果表明:近断层速度脉冲地震动对边坡产生特殊的破坏作用,表现在滑动位移值大、滑动体破坏力强等方面;边坡永久位移值与速度脉冲地震动的峰值速度具有高度相关性,位移值较大时尤为明显。建立了基于单变量形式的峰值速度及双变量形式的峰值速度、峰值加速度两种边坡永久位移预测模型,模型简单实用,与回归数据具有很好的相关性,前者更适用于预测对实际工程影响较大的永久位移值,且离散性较小。提出的预测模型为考虑近断层地震动速度脉冲特性影响的边坡永久位移值的概率地震灾害分析提供了基础。
Based on the wavelet analysis method, 189 velocity impulsive earthquakes are selected from 3 551 seismic records in the NGA database, and the earthquakes are all converted into the direction of the strongest impulses. Based on Newmark method, the value of permanent displacement of slope caused by near-fault velocity pulse ground motion is analyzed. The results show that the near-fault pulse ground motion has a special destructive effect on the slope, which is characterized by a large sliding displacement and a strong destructive force of the sliding body. The permanent displacement of the slope is highly correlated with the peak velocity of the velocity pulse ground motion , Especially when the displacement value is large. Two models of peak displacement and peak acceleration based on univariable form of peak velocity and peak acceleration are established. The model is simple and practical and has good correlation with regression data. The former is more suitable for prediction of actual engineering Affect the larger permanent displacement value, and less discrete. The proposed prediction model provides the foundation for the probabilistic seismic disaster analysis of slope displacement due to the pulse characteristics of near-fault ground motions.