基于离散元的矿渣泥石流运动过程研究

The movement process of slag debris flow based on the discrete element method

矿渣具有散粒体的基本特征,在降雨作用下可以启动形成泥石流。为了解矿渣堆积物质启动形成泥石流的过程与降雨强度的关系,利用PFC^(2D)颗粒流软件对该矿渣泥石流进行不同雨强工况下的数值仿真,探究矿渣堆积体演化为泥石流的形态变化,揭示矿渣堆积体作为泥石流物源在降雨作用下颗粒位移和速度的变化规律,总结该矿渣型泥石流启动到暴发过程中颗粒内部力学特征。研究成果对进一步认识矿渣泥石流的启动机制、运移规律以及泥石流防治具有理论及实际意义。

Slag shows certain characteristics of granular mixtures,and it turn into debris flow under the effect of rainfall. In order to explore the relationship between the process of slag accumulation body forming into the slag debris flow and the rainfall intensity,simulate the process under various working condition by using the two-dimensional particle flow code sofiware-PFC2 D. Through the investigation,it comes to the rule of the slag accumulation in morphologic and the change in position as well as the velocity of the slag particle,and the conclusion about internal mechanical characteristics change between the process of slag debris flow outbreak is also proposed. The research results would make sense to the further understanding of the initiation mechanism in slag debris flow.