矸石山剖面颗粒分布规律的实验研究

为研究矸石山内部剖面上不同粒径矸石的分布规律,首先利用因次分析方法,将影响矸石山堆积过程的10个物理力学参数简化为3个无因次量,并依此结果确定实验的相似判据与相似比,进而采用相似模拟方法对矸石山的整个堆积过程进行还原与再现。实验结果表明:矸石山顶部多分布为小粒径矸石,底部多分布大粒径矸石,中部区域由小粒径与中等粒径、中等粒径与大粒径交替发生尖灭而形成倾斜的锯齿状条纹结构;每条条纹存在2个临界角:一个是矸石颗粒能保持稳定的角度,约为24°～26°;另一个是矸石颗粒停止下滑的角度,约为34°～36°。

Experimental Studies for the Particle Size Distribution of Mine Spoil Pile Cross Section

For analyzing the different particle size distribution of mine spoil pile cross section. Dimensional method is employed firstly to abbreviate ten physical and mechanical parameters, which could describe the whole packing procedure of mine spoil pile, to three non-dimensional numbers, and then the similarity criterion and coefficient are determined and calculated. The similarity model is constructed to representation the packing process of the mine spoil pile. The cross section of the final model shows that the small size particles are mainly composed in the upper zone of the mine spoil pile, and the bottom of the pile is mainly dominated by larger size particles, and the intermediate section presents a zigzag stripe cross-bedding structure which composed by small-medium scale particles and medium-large scale particles. Each stripe has two critical angles: one is the angle could maintain particles with stability condition, which approximately varies between 24 and 26 degree; and the other is the angle which makes particles stop gliding down on the slpoe, with degree in the approximate range from 34 to 36.