Abstract
Abstract By means of similar tests, the stope room is scaled and the process of multiple-drawpoint ore drawing under the influence of a flexible barrier is simulated by the marking particle method. Based on the experimental phenomena and data, the shape of the barrier, the draw column, and the numerical relations for the discharge between each drawpoint are analysed. The velocity equation for ore particles flowing through multiple drawpoints is established and the relationship between ore particle flow properties and velocity fields is found. Finally, the following results are derived: 1) For each layer, the morphology of marked particles is similar to that of vertical velocity. The particles are quasi-linear in the upper part of the model and wavy in the lower part. The amplitude increases with decreasing height. 2) The distribution of thirteen concentric points of horizontal velocity in each layer illustrate that the ore particles drawn from each drawpoint are from the centreline between it and the adjacent drawpoint. 3) The barrier and the marked particles are at the lowest sag points at the top of the number two and number six drawpoints (close to the model’s side wall) because of the combination of vertical velocity and horizontal velocity.
Highlights
Under the guidance of green, no-waste mining [1,2,3,4], the idea of “synchronous filling” in mining technologyThe motion condition of each particle in the stope room can be determined by the distribution of its velocity field; the motion trail of ore particles and the morphology of the draw column can be determined by this velocity field, which can provide a theoretical basis for stope design and stope structure parameter optimization
The velocity field of ore particles is the basis of determining their motion trail and the morphology of the draw column, and it is one of the core contents of draw theory
The main feature of the method of mass draw and synchronous filling with no-top-pillar shrinkage stoping is that a flexible barrier is laid on the surface of an ore pile before drawing the ore
Summary
Under the guidance of green, no-waste mining [1,2,3,4], the idea of “synchronous filling” in mining technology. The above studies provide new ideas for further development of draw theory, but these studies focused on the flow laws and velocity fields of ore and rock under the condition of a single drawpoint; few studies have considered the condition of more complex, multiple drawpoints, and the influence of flexible barriers has not been considered. Based on classical draw theory and considering the influence of a flexible barrier, this study examines the flow patterns and the velocity field equations of ore particles and the correlation between them with multiple drawpoints. This further promotes research on the method of mass draw and synchronous filling with no-top-pillar shrinkage stoping
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