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黏性碎屑流是常见崩滑灾害运移形式,其动力特性是此类灾害致灾过程中研究的关键环节。为探讨黏性碎屑流坡面运移全过程的动力学特性,在实验测定泥浆力学参数基础上,利用PFC3D离散单元法(discrete element method,DEM),模拟黏性碎屑流坡面运动全过程。通过监测颗粒间平均接触力、平均不平衡力及特定颗粒坡面运动过程空间位置、平动速率、转动速率等运动力学参数变化过程,将运移过程划分为启动、运移和堆积三阶段,结合颗粒间平均接触力及不平衡力变化过程,对各阶段动力学特性进行定性分析。结果表明,各阶段内部平均接触力变化表现为,减小—增加—稳定;运动速率变化表现为,高频小幅波动及缓增速—低频大幅波动及快增速—高频小幅波动及减速稳定。
The viscous debris flow is a common form of landslide disasters, and its dynamic characteristics are the key links in the research of disaster disasters. In order to explore the dynamic characteristics of the whole process of viscous debris flow on the slope, based on the experimental determination of mud mechanics parameters, PFC3D discrete element method (DEM) process. Through the monitoring of the average contact force between particles, the average unbalanced force and the spatial position, the translational velocity and the rotation velocity of the particles, the migration process is divided into three stages of initiation, migration and accumulation, Combined with the process of the average contact force between particles and the process of unbalance force, the dynamic characteristics of each stage were qualitatively analyzed. The results show that the average internal contact force changes in each stage are as follows: decreasing-increasing-stabilizing; moving speed changing as follows: high-frequency small-amplitude fluctuation and slow-growth rate-low frequency large amplitude fluctuation and fast growth rate-high frequency small amplitude fluctuation and deceleration stabilization .