This study presents the initiation and kinetics characteristics of the Xiaogangjian (XGJ) rockslide failure via three-dimensional (3D) discrete element method (DEM) simulations, particularly taking into consideration of the discrete fracture network (DFN) and rainwater infiltration. The results show that the failure of the locking section of XGJ rockslide caused by high hydrostatic pressure is the major reason that triggers the rockslide. In the process of movement, the maximum velocity is 84.53 m/s and the maximum displacement is 1.81 km. The total movement time of the sliding mass is about 266 s. The movement path of the sliding mass is controlled by the terrain. In addition, the numerical simulation results also show the influence of equivalent internal friction angle and density of joints. Larger equivalent internal friction angle of joints is beneficial to the stability of rock mass and can reduce the depositional range. Larger joint density can make slope failure more obvious. The simulated movement path and depositional area are in good agreement with field investigation. This work provides a new method for the related rockslide research, and contribute a technical note for the comprehensive risk assessment and mitigation in shattered mountains.

这项研究通过三维（3D）离散元方法（DEM）模拟，特别是考虑了离散裂缝网络（DFN）和雨水入渗的情况，揭示了小港尖（XGJ）滑坡破坏的起因和动力学特征。结果表明，高静水压力引起的XGJ岩体滑坡锁定段破坏是触发岩体滑坡的主要原因。在运动过程中，最大速度为84.53 m / s，最大位移为1.81 km。滑动块的总运动时间约为266 s。滑动块的移动路径由地形控制。此外，数值模拟结果还显示了等效内摩擦角和接头密度的影响。节理的等效当量内摩擦角较大，有利于岩体的稳定，并能减小沉积范围。较大的接缝密度会使斜坡破坏更加明显。模拟的运动路径和沉积面积与野外调查非常吻合。这项工作为相关的岩质滑坡研究提供了一种新方法，并为破碎山地的综合风险评估和缓解提供了技术说明。