复杂斜坡动力响应特征分析

深切谷坡浅表部卸荷裂隙发育，风化强烈，致使浅表层成为非连续介质，出现介质性质差异，地震动响应由此变得复杂。通过对青川东山斜坡地震动监测数据进行分析，并结合适用于分析岩质边坡运动过程的非连续变形分析(DDA)方法对青川东山斜坡动力响应特征进行数值模拟，揭示了震中距、高程、震级、地形以及“丁”字形山体等因素对地震波峰值加速度(PGA)放大的影响。结果表明垂直山脊方向以及高程较高时的地震波峰值加速度放大倍数较大，可达6.12倍;在地形突出部位，地震波亦能得到一定程度的放大，放大倍数可达3.3倍;在“丁”字形山脊结合部位，PGA放大倍数会出现一定程度的减小。

Seismic Response of a Slope with Complex Shape

Unloading fractures developed well in the superficial part of deep valley slope and was strongly weath-ered,which made subcutaneous layer a non-continuum and led to dielectric property difference.Seismic response in this area is complicated.Taking Dongshan slope in Qingchuan city as an example,we firstly analyzed the seis-mic monitoring data,and then simulated the dynamic response characteristics of the slope by using discontinuous deformation analysis method which is suitable for the analysis of rock slope motion process.We revealed the influ-ences of epicentral distance,elevation,magnitude ,terrain and T-shaped mountains and other factors on seismic peak ground acceleration (PGA).The results indicate that the seismic peak acceleration amplification factor at ver-tical ridge direction and higher elevation is larger,reaching 6.12 times;on the protrusion part of the terrain,seis-mic wave can also get a certain degree of amplification,reach 3.3 times;in the T-shaped ridge binding site,the PGA amplification ratio will be reduced to a certain degree.