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泥浆影响下粗颗粒坡面运移数值模拟与分析

     

摘要

Based on the mechanical parameters experimental determination of mud, this paper used PFC3D discrete element method, simulated the movement process of viscous debris flow along slope, monitored the change process about the space migration path and motion transmissibility about the specific coarse particles representing different parts of viscous debris flow, preliminary analyzed migra-tion trajectory differences of different spatial positions particle and their impact on the rate of movement. The simulation results showed that the PFC3D discrete element method can well reproduce the starting, moving along slope, piling up whole process of viscous debris flow, the particle collisions along the slope make the horizontal scope expand, the front of the particle motion acceleration time early, with a high rate of movement and impact energy, affected by the surrounding particles are small, providing a new analysis way of vis-cous debris flow moving process along slope and a reference for prevention of its.%在实验测定泥浆力学参数基础上,利用PFC3D离散单元法,模拟粘性碎屑坡面运动全过程,跟踪记录代表不同部位特定颗粒空间运移轨迹、运动速率变化过程. 初步分析不同位置颗粒空间运移轨迹的差异及其对运动速率的影响. 结果表明,PFC3D离散单元法能很好再现粘性碎屑流坡面启动、运移和堆积全过程;颗粒碰撞使其沿坡面横向扩展,增大其致灾范围;前端颗粒运动加速时间早,受周围颗粒影响小,具有较高的运动速率和冲击动能.为粘性碎屑流坡面运移过程分析提供新途径,为此类灾害防治提供参考.

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