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混合颗粒的堆积问题一直是自然界以及工业界一个悬而未决的问题。研究的对象是相同密度不同尺寸的两相混合颗粒。通过三维离散元软件PFC3D建立高仿真数值模型并进行离散元数值试验,通过数值模拟和试验对比确定本次研究所用的参数。然后对不同条件斜槽下的颗粒堆积形态进行观察并总结其堆积规律;紧接着进一步测定相同体积条件下均匀颗粒和混合颗粒分别对结构体的动力荷载变化;最终通过研究不同斜槽约束条件下混合粒径条件下的颗粒流的运动情况并得到相应规律性的结果。通过研究发现,混合颗粒粒径条件下的颗粒流运动情况和均匀颗粒粒径条件下的颗粒流运动情况差异较大,颗粒分选对其动能的影响,有约束条件下的斜槽会增加颗粒流的滑程并提高其龙头的速度。该结论对于揭示碎屑流远程特性有一定的参考价值。
The accumulation of mixed particles has always been an unresolved issue in nature and in industry. The object of study is two-phase mixed particles of the same density and different sizes. Through the three-dimensional discrete element software PFC3D, a high simulation numerical model is established and discrete element numerical tests are carried out. The parameters used in this study are determined by numerical simulation and experiments. Then, the stacking patterns of particles under different conditions were observed and the stacking rules were summarized. Then the dynamic load changes of the structure under the same volume were further measured. Finally, by studying the different chute constraints Particle flow conditions under the conditions of particle flow and get the corresponding regularity of the results. Through the research, it is found that the particle flow motion under the condition of mixed particle size is different from the particle flow motion under the condition of uniform particle size. The effect of particle separation on its kinetic energy, Flow the slip and increase the speed of its faucet. This conclusion has certain reference value for revealing the remote characteristics of debris flow.