耦合地震作用下多级非均质土坡动力响应规律

Dynamic Response Regularity of Multi Stage Heterogeneous Slope Under Action of Coupling Earthquake

对多级非均质边坡,采用基线校正的10 s水平加速度时程和竖向加速度时程作为地震输入条件,对坡面质点的位移、速度、加速度三量响应规律进行分析。结果表明:在双向耦合地震波的作用下,多级非均质土坡坡面质点的位移和速度随高程的增加而增大,坡体质点的最大水平动位移和最大竖向动位移均在坡顶出现峰值;引入PGA放大系数对坡面质点加速度进行描述,坡面质点的加速度放大系数随高程增加时而增大时而减小,在每一级土坡会发生律动现象;水平三量峰值与竖向三量峰值之比的大小顺序为位移>速度>加速度。

As for the multilevel heterogeneous slope,the interception of10 s horizontal acceleration time history and vertical acceleration time history were taken as the conditions of earthquake input in this study,on the other hand,the slope displacement,velocity and acceleration response of the particle regularity was also analyzed. The results show that,under the action of seismic wave of the two way coupling,the horizontal displacement and speed of the multilevel heterogeneous soil particle are increased with the increase of the elevation,and the peak value appears at the top. The acceleration amplification factor of slope particle changes regularly with the change of the series of the soil.However,the peak value of the horizontal and vertical acceleration of the slope are not appeared at the top,the ratio order of the horizontal three measured peak value and the vertical three measured peak value is displacement,speed and speed acceleration under the action of the coupling earthquake.