基于PFC3D的鱼鳅坡滑坡运动过程分析

以贵州省开阳县鱼鳅坡滑坡为研究对象，采用颗粒流离散元（PFC3D）对其破坏运动过程进行数值模拟。采用Ball-Wall建模方法建立滑坡模型，对滑坡不同关键部位颗粒进行位移、速度监测，阐明其破坏运动特征。结果表明，降雨为鱼鳅坡滑坡的直接诱发因素。该滑坡在破坏初始阶段以蠕滑变形为主，随着变形量的增加，滑坡体不断挤压坡脚，滑坡岩土体到达应力平衡极限，坡脚产生剪切破坏，并向上牵引发展，滑坡发生整体滑动，斜坡变形破坏模式为蠕滑-拉裂，按照力学条件为牵引式破坏。滑坡滑动最高时速12.4 m/s，最大滑移80 m，滑动阶段持续50 s。研究成果可为对该类滑坡影响范围预测，以及工程措施的制定具有一定的参考意义。

Analysis of Yuqiupo landslide motion process based on PFC3D

A case study of the Yuqiupo landslide in Kaiyang County, Guizhou Province, the particle flow discrete element (PFC3D) was used to simulate the failure process of the landslide. The landslide model was built through the Ball-Wall method, and the characteristics of their destructive movement was described through the monitoring of the displacement and velocity of the particles at different key parts of the landslide. The results show that the rainfall is the direct inducing factor of the Yuqiupo landslide. In the initial stage of failure, the landslide is mainly creep deformation. The landslide continuously squeezes the slope toe with the increase of the deformation. The landslide rock-soil mass reaches the stress equilibrium limit, leading to shear failure at the slope foot, and the landslide happens with upward traction development, the failure mode is creep-crack, and it is traction failure according to the mechanical conditions. The maximum sliding speed of the landslide is 12.4 m/s, the maximum sliding slip is 80 m, and the sliding stage lasts for 50 s. The results have a good applicability to simulate the process of landslide destruction, which can provide a reference for engineering construction.