基于颗粒离散元的某降雨滑坡破坏运动特征研究
Study on Failure Movement Characteristics of a Rainfall Landslide Based on Particle Discrete Element

为研究降雨作用下河南省伊川县某滑坡的破坏运动特征分析，利用颗粒离散元软件，采用Ball-Wall法建立1:1数值计算模型并进行模拟计算，得出不同时间步长下的速度与位移云图，并在坡体不同的位置记录坡体运动过程中位移及速度变化的情况。研究结果表明：该滑坡整体破坏特征为：中部剪切–前缘牵引–后缘拉裂。表现为蠕滑–拉裂式破坏。前期坡体处于蠕滑阶段，坡体在位中前部位移速度最大，该位置率先破坏，其次为后缘部位，中前部与后缘因速度差挤压前方颗粒，随着时间推移，前缘部位颗粒开始剪出，后缘出现张拉裂缝，后续速度变化较为稳定，有整体下滑的趋势。
In order to study the failure motion characteristics of a landslide in Yichuan County, Henan Province, under the action of rainfall, a 1:1 numerical calculation model was established by using the particle discrete element software and the Ball-Wall method and simulated. The velocity and displacement cloud patterns under different time steps were obtained, and the displacement and velocity changes during the movement of the slope were recorded at different positions of the slope. The research results show that the overall failure characteristics of the landslide are the middle shear-leading edge traction-trailing edge tensile cracking. The performance is a creep-tensile cracking failure. The slope is in the creep stage in the early stage, and the moving speed of the front part of the slope is the largest in the middle, which is the first to be destroyed, followed by the trailing edge. The front and rear parts of the slope are squeezed by the speed difference. As time goes by, the front edge particles begin to cut out, and tensile cracks appear on the trailing edge. The subsequent speed changes are relatively stable, and there is an overall downward trend.