地震作用下边坡的动态响应规律研究

Dynamic response of slopes under earthquakes

以印度Koyna地震为输入动荷载,利用ABAQUS软件建立了一个均质土坡动力数值分析模型。在此基础上,分析了该地震作用下边坡的动力响应规律。结果表明,边坡对地震加速度存在放大作用,坡顶水平向峰值加速度为1.0 m/s2,约为输入地震峰值加速度的3倍;坡顶竖向峰值加速度为0.8 m/s2,约为输入地震峰值加速度的3.2倍;在当土体发生破损以后坡体位移随地震持时的增加而增大,存在变形累积效应。研究结果有助于进一步揭示边坡在地震作用下的失稳机制。

Taking Indian Koyna earthquake as input dynamic loads,a dynamic numerical analysis model of soil slopes is established by ABAQUS program.Based on this,the dynamic response under earthquake is analyzed.It is shown that the slope has an amplification effect on earthquake acceleration.The horizontal peak acceleration in the slope roof is 1.0 m/s2;approximately 3 times of the inputted earthquake peak acceleration;the vertical peak acceleration in the slope roof is 0.8 m/s2;approximately 3.2 times of the inputted earthquake peak acceleration.When the soil body is damaged,the slope body displacement will be enlarged along with the increase of the earthquake duration time,which causes a distortion cumulative effect.The results are helpful to further researches on the slope instability mechanism under earthquake.