中倾侧向坡中一种岩体破坏过程的模拟研究

基于G318国道雅安市飞仙关隧道出口东侧约1 km处公路内侧失稳边坡岩体野外详细调查，运用三维离散元程序，对已失稳边坡还原地质体并进行数值计算分析，阐明岩质边坡在失稳破坏过程中速度和位移的变化规律。分析结果表明:边坡岩体失稳首先是关键块体受挤压发生剪切破坏，然后导致后缘岩体失去平衡而发生滑移；在失稳破坏过程中，整体位移演化大致分为5个阶段，速度演化大致分为4个阶段，关键块体的位移和速度较失稳岩体要小，随着计算时步增加，他们之间的差值增大。

Simulation Study of a Rock Mass Failure Process in a Medium-inclined Lateral Slope

Based on the detailed survey of rock mass inside the unstable slope of highway about 1 km east of the exit of the Feixianguan tunnel on the G318 national road in Ya'an city, combined with the three-dimension discrete element program, the geological body was restored and numerically calculated on the unstable slope to clarify the changing law of speed and displacement of the unstable rock slope during the failure process. The analysis results show that the unstability of slope rock mass is firstly the shear failure of the key block under compression, and then the trailing edge of rock mass loses balance and slips, at the same time, in the process of instability and failure, the overall displacement evolution is roughly divided into five stages, and the velocity evolution is roughly divided into four stages, the displacement and velocity of key blocks are smaller than those of unstable rocks, as the calculation time increases, the difference between them is more greater.