Lab Simulation of Gravity Ore Flow in Caving Systems of Mining
A. A. Smirnov, A. A. Rozhkov, K. V. Baranovskiy
Institute of Mining, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
Keywords: Broken ore, cave mining, single-side draw, draw point, internal friction angle, degree of fragmentation, grain size composition
Abstract
Physical lab-scale simulation finds out that in polydisperse broken ore draw, the medium undergoes structuring which leads to the formation of a consolidated block shaped as a flaring cone. Along the side surfaces of the cone, slide zones originate as layers of small size particles. The angle of the cone generators is governed by the internal friction angle of the medium, which depends on the degree of fragmentation and on the grain size composition. An empirical formula is proposed for calculating the angle of the cone generators. The obtained results make it possible to develop an algorithm and a method for optimizing parameters of structural elements in the caving systems of mining with self-propelled machinery.
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