地震作用下黄土滑坡离散元数值模拟研究

Research on Discrete Element Numerical Simulation of Loess Landslide under Earthquakes

为了对地震荷载作用下黄土滑坡的运动滑移规律进行深入探究,采用离散单元法对甘肃黑方台滑坡进行了地震荷载作用下的滑坡体运动数值模拟研究。结果表明:地震荷载作用下黄土滑坡存在滑源区、流通区以及堆积区3个部分,滑源区的残积土结构相较于滑动前更加松散;且滑源区近坡面不同位置颗粒的滑动位移差异性较大,处于滑坡体前缘的颗粒位移量最大,处于滑坡体后缘的颗粒位移量较小,随着深度的增加,颗粒的位移量逐渐减小,且差异性较大。

In order to deeply explore the motion and slip laws of loess landslide under earthquake loads,this paper used the discrete element method to numerically simulate the motion of the landslide mass under earthquake loads based on the Heifangtai Landslide in Gansu.The results show that the loess landslide has three parts under the earthquake loads,namely,the source area,the circulation area,and the accumulation area.The residual soil structure in the source area is looser than that before the sliding.In addition,the sliding displacement of particles at different positions near the slope surface in the source area varies greatly.The displacement of particles at the leading edge of the landslide mass is the largest,and that of particles at the trailing edge of the landslide is smaller.As the depth increases,the displacement of particles gradually decreases,and the difference is large.