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针对地震动作用下影响公路边坡稳定性的关键因素,采用三维离散元动力响应分析方法,建立了公路边坡三维离散元模型,确定了动力计算的主要参数,选取不同坡高、坡度、岩层倾角以及不同地震波参数进行组合,研究了公路边坡在地震动荷载作用下永久动力位移的响应规律。研究结果表明:在坡高10~70m范围内,边坡的永久动力位移随坡高的增大而单调增大;边坡坡度在50°左右时永久位移达到最大;边坡位移随着地震波频率增加而减少,当频率超过10Hz时,边坡位移随频率的增加变化不大,趋于稳定;高烈度地震区路线边坡设计应控制边坡高度,避免50°左右的边坡坡度,宜选择小于30°的边坡设计;基于三维离散元的边坡永久动力位移分析方法计算结果准确可行。
Aiming at the key factors that affect the stability of highway slope under the action of earthquake, a three-dimensional discrete element dynamic response analysis method is used to establish the three-dimensional discrete element model of highway slope. The main parameters of dynamic calculation are determined. Different slope height, slope, Dip angle and different seismic wave parameters, the response law of permanent dynamic displacement of highway slope under earthquake ground motion is studied. The results show that the permanent dynamic displacement of the slope increases monotonically with the increase of slope height in the range of 10 ~ 70m of slope height. The displacement of the slope reaches the maximum when the slope gradient is about 50 °. The displacement of the slope varies with the seismic wave frequency When the frequency is more than 10Hz, the displacement of the slope changes little with the increase of the frequency and tends to be stable. In the high intensity seismic line, the slope height should be controlled in order to avoid the gradient of about 50 °, Slope design less than 30 °. The calculation results of slope dynamic displacement analysis based on 3D discrete element method are accurate and feasible.