摘要
对某阶梯型多土层边坡,采用原始记录的EI centro水平、竖向地震波作为地震动输入条件,引入位移、速度、加速度等3量的放大系数对边坡坡面的动力响应特性进行描述,并进行动力稳定性分析.计算结果表明:在地震作用下,边坡坡面质点的位移、速度随高程的增加呈增大的趋势,而加速度随高程的增加呈不规则变化;耦合地震作用下的动力响应比水平地震更为剧烈;在耦合地震作用下,坡面质点的水平三量峰值与竖向三量峰值之比的大小顺序为:速度(3.59)>位移(2.66)>加速度(2.20);采用两种动力稳定性分析方法计算的安全系数大致相同,计算结果相差在5%以内,且耦合地震作用下的安全系数要略小于水平地震作用下的安全系数,说明在工程上需要考虑耦合地震的影响.
The dynamic response characteristics of a ladder-type heterogeneous slope with multiple layers were characterized by using the original records of El centro horizontal and vertical seismic waves as a condition of the ground motion input and introducing the three volume amplification factors of displacement, speed, and accelerated speed and a dynamic stability analysis was made. The results show that： under the action of seismic waves, the displacement of the mass points on the surface of the side slope and the speed increase with the increase of elevation while the acceleration became irregular with the increase of the elevation; the dynamic response under the action of coupling seismic waves was more intense than under the action of horizontal seismic waves; under the action of coupling seismic waves, the size order of the ratio of the horizontal three-peak value to the vertical three-peak value of the mass points on the slope surface was： speed （3.59） 〉 displacement （2.66） 〉 acceleration （2.2）; the safety coefficient derived by two dynamic stability analysis methods were roughly the same and the difference of the calculation results was within 5%, and the safety factors under the action of coupling seismic waves was less than that under the action of horizontal seismic waves. Thus the impact of coupling seismic waves should be taken into consideration in engineering.
出处
《五邑大学学报（自然科学版）》
CAS
2015年第3期39-44,共6页
Journal of Wuyi University(Natural Science Edition)
关键词
耦合地震
阶梯型边坡
多土层边坡
动力稳定性
coupling earthquake
ladder-type slopes
multiple layers
dynamic stability
