颗粒介质表面再生区域形状研究

Study of blanket shape on the granular medium surface

大块物体从山体上滚下时,山体结构将被破坏,其前方堆起的区域称为再生区域。为了认识该自然现象的形成机制,搭建了可调角度的三维颗粒介质槽,利用图片处理技术研究了球形物体在颗粒介质表面运动形成的再生区域形状与球尺寸的关系。实验结果表明再生区域形状呈类抛物线型,并与球尺寸有关,即形状长、半宽度最大值和面积均随着小球尺寸的增大而增大。分析认为,再生区域形成过程中有两种作用机制,即球与颗粒介质作用机制和介质与介质粘滞运动机制,并且前者作用略强于后者;同时发现在粘滞作用区域中,再生区域的形成过程是一种非牛顿流体的运动。

When a big object rolling on the surface of the mountain, the mountain structure may be destroyed. Blanket is a region generated by uplift granules stopped in front of the object. In order to understand this natural phenomenon, an angle adjustable three-dimensional granular medium groove was constructed. The relation of blanket shape which is generated by the spherical objects with the particle＇s diameter was established by means of image processing technology. Results show that the blanket shape is a quasi-parabola, and it is related to the particle＇s diameter, namely the maximum long and half-width of blanket and area increases with both particles＇ diameter. It is found that the blanket shape formation has two mechanisms of action, namely sphere and granular medium action mechanism and medium and medium viscous mechanism, and the former is little better than the latter. The blanket shape formation is non-Newtonian fluid in the viscous region.