Abstract
The paper offers an underground geotechnology for thick coal beds based on the controllable force-feed extraction of pre-broken coal with using a re-designed powered roof support. Based on the discrete element method, the mathematical model has been developed for the numerical simulation of gravitation movement of granular materials. The two-dimensional problem about sublevel coal caving in thick beds is studied, and the effect exerted by the order of opening the roof support outlets on the coal extraction parameters is illustrated.
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