【摘要】 地震作用下边坡的动力响应研究是边坡动力稳定分析的基础,利用FLAC3D有限差分软件建立一个顺层岩质边坡动力数值模拟模型,对其在竖向和水平向地震耦合作用下的动力响应全过程进行研究。研究表明,地震竖向和水平向耦合作用模拟比简单的模拟水平向振动更加接近实际情况,对岩土体的破坏更大;顺层岩质边坡在耦合地震作用下存在垂直放大和临空面放大作用;坡面水平向和竖向加速度均随高程增加呈增大趋势,在结构面处增大特别明显;竖向地震波产生的水平与竖向拉裂是触发斜坡体产生初期崩滑破坏的主控因素;边坡动力响应特征值的放大效应表明,其放大系数值从大到小依次是:竖向加速度>水平加速度>竖向速度>水平速度;耦合地震波作用下,随着av/aH的增大,坡面监测各点横向位移基本呈增大趋势,说明竖向地震作用起了重要的破坏作用。更多还原

【Abstract】 The dynamic response of slopes under earthquake is the basis of slope dynamic stability research.A dynamic numerical simulation model of bedding rock slope with bolts was established by using FLAC3D program;the dynamic response under coupling vertical and horizontal seismic waves is studied.The result of numerical simulation shows that the coupling vertical and horizontal seismic waves are closer to the actual situation and make greater destruction of the rock mass.Amplifications in the vertical zoom and free surface exist in bedding rock slope under coupling effects of earthquake.With elevation increasing,the horizontal and vertical accelerations of slope increase,particularly at the structural surface.Master factors of slope body early slump destruction are horizontal and vertical crack generated by vertical seismic waves.Amplification effect of parameters in slope dynamic response shows that the amplification coefficient of vertical acceleration is larger than that of horizontal acceleration;and the vertical and horizontal velocity decreasing one by one.With the increasing of aV/aH under coupling effects of earthquake,the horizontal displacement of monitoring points increase and it proves that the vertical seismic action plays an important role in the destruction.更多还原