地震作用下边坡台阶对均质公路路堑边坡的动力响应影响研究

Research on Influence of Slope Steps on Dynamic Response of Homogeneous Highway Cutting Slope under Earthquake

以西南地区某二级公路均质路堑边坡为例,设置三种不同的边坡模型,耦合输入EI-Centro地震波,利用ANSYS软件建立数值分析模型,分析三种边坡模型的动力响应规律。结果表明:随着台阶数的增加,边坡各参数放大系数呈现逐步减小的趋势,由此可见增加台阶可以使边坡在地震作用下受力更加均匀,有利于控制边坡位移,分台阶处理边坡可以降低边坡的地震动反应,提高边坡的动稳定性;同时随着地震动的输入,各种模型的塑性区出现顺序也有所不同,总结了各种模型的危险点和安全点,提出了与之相应的治理建议。

Taking the homogeneous cutting slope of a class II highway in Southwest China as an example,three different slope models are set,EI-Centro seismic waves are coupled and input,and the numerical analysis model is established by ANSYS software,so as to analyze the dynamic response law of the three slope models.The results show that:with the increase of the number of steps,the amplification factors of various parameters of the slope gradually decrease.It can be seen that increasing the steps can make the stress of the slope more uniform under the action of earthquake,which is conducive to controlling the slope displacement.The step treatment of the slope can reduce the seismic response of the slope and improve the dynamic stability of the slope;at the same time,with the input of earthquake motion,the order of plastic zones of various models is also different.The dangerous points and safety points of various models are summarized,and the corresponding treatment suggestions are put forward.