Aguirre MA, Nerone N, Calvo A, Ippolito I, Bideau D
Grupo de Medios Porosos, Facultad de Ingenieria, Universidad de Buenos Aires, Paseo Colon 850, 1063 Buenos Aires, Argentina.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 2000 Jul;62(1 Pt B):738-43. doi: 10.1103/physreve.62.738.
This paper reports an experimental study on avalanches in a granular material contained in a confined geometry. The granular packing is made of monosize glass beads initially poured into a box that is slowly inclined until an avalanche takes place at a critical angle straight theta(M) (maximum angle of stability). The avalanche involves a decrease of the surface slope until a second critical angle straight theta(r) (angle of repose) is reached. Both angles and the mass displaced out of the box during the avalanche are studied as a function of the height of the granular packing. In order to avoid cohesion effects, experiments are carried out in a humidity controlled environment. For small packings, up to approximately ten layers, the stability of the system is significantly affected by the rough surface at the bottom. In contrast, for thicker systems, critical angles do not depend on the height.
本文报道了一项关于受限几何形状中颗粒材料雪崩现象的实验研究。颗粒填充物由单一尺寸的玻璃珠制成，最初倒入一个盒子中，盒子缓慢倾斜，直到在临界角θ(M)（最大稳定角）处发生雪崩。雪崩过程中表面坡度会减小，直到达到第二个临界角θ(r)（休止角）。研究了这两个角度以及雪崩过程中从盒子中排出的质量与颗粒填充物高度的函数关系。为避免凝聚效应，实验在湿度受控的环境中进行。对于厚度达约十层的小填充物，系统的稳定性受底部粗糙表面的显著影响。相比之下，对于更厚的系统，临界角并不取决于高度。
