Abstract
It is of great significance to carry out quantitative research on the contact force chain characteristics of ore particle systems during ore drawing to reveal the microscopic and mesoscopic characteristics of ore particle systems during implementation of the synchronous filling shrinkage stoping method. Based on the particle discrete element method, combined with the relevant knowledge of contact mechanics and statistical mechanics, microscopic properties of the ore particle system were studied quantitatively. (1) The probability distributions of the normal and tangential contact forces during ore drawing from a single drawpoint under a flexible barrier are similar, and both show exponential decay. (2) In the regions on both sides of the model, the ore particles will not be released because they are far from the drawpoint; there, the coordination number is stable, and the density of contact network is large. In the upper part of the drawpoint, ore particles flow, the coordination number fluctuates violently, and the density of contact network is small. (3) In the initial stage, the stress distribution of the ore particle system is uniform, and the strong force chain does not show obvious directivity. After that, the directions of the strong force chains in the ore particle system are inclined to the vertical direction, and the strong force chains mainly bear the load in the vertical direction. (4) In the initial stage of drawing, the normal contact force is mainly concentrated in the vertical direction. With the progression of drawing, the normal contact force at an angle of 30° to the horizontal direction increases gradually, and the number of the main direction of the average contact force distribution changes from one to three (the vertical direction and the direction with a ±30° angle to the horizontal direction).
Highlights
In 2010, the authors proposed the idea of “synchronous filling” and invented a representative mining method, namely, “the mass draw and synchronous filling with no-top-pillar shrinkage stoping method” [1]
The directions of the strong force chains in the ore particle system are inclined to the vertical direction, and the strong force chains mainly bear the load in the vertical direction
The above studies have been carried out on the microand mesoscopic characteristics of the granular matter system under shear, compression, and static accumulation; these studies are all in a preliminary stage of exploration, and there is no unified standard for quantitative research on contact force and force chain characteristics; none of them have been involved in the field of ore drawing
Summary
In 2010, the authors proposed the idea of “synchronous filling” and invented a representative mining method, namely, “the mass draw and synchronous filling with no-top-pillar shrinkage stoping method” (synchronous filling shrinkage stoping method) [1]. To further reveal the internal action mechanism of the flow process of ore particles under the influence of a flexible barrier, it is of great significance to study the contact forces and the force chain formed by them. The above studies have been carried out on the microand mesoscopic characteristics of the granular matter system under shear, compression, and static accumulation; these studies are all in a preliminary stage of exploration, and there is no unified standard for quantitative research on contact force and force chain characteristics; none of them have been involved in the field of ore drawing. On the basis of previous studies and with the background of the synchronous filling retention method, this paper quantified the contact force and force chain characteristics in the ore particle system under the influence of a flexible barrier to provide a new approach to the study of metal ore drawing
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