Abstract:Aiming at the stress concentration in the rock pillars among near-vertical coal seams, a horizontal sublevel top coal caving mining method with filling for pressure relief and rock burst prevention is proposed. By means of numerical simulation, the effects of various filling mining schemes on the prevention and control of rock bursts are investigated. The outcomes indicate that, in comparison to mining without filling, the stress concentration in the interlayer rock pillar area in schemes two, three, and four is reduced by 25.0534%, 26.5237%, and 29.2254% respectively, as opposed to scheme one. In the high stress concentration zones of the lower section coal mass, the B3+6 coal seam exhibits a more pronounced stress relief effect than the B1+2 coal seam, with a stress reduction of 10.6179%, 10.7579%, and 12.3298% in schemes two, three, and four respectively, compared to scheme one. The filling strategy, integrated with intelligent monitoring techniques, constructs an intelligent control system that guides the filling mining based on the monitoring of the stress concentration coefficient. The findings of this study can offer insights for the management of rock bursts in the extraction of near-vertical coal seam clusters.
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