近直立煤层群水平分段综放开采充填卸压防冲研究
Research on Pressure Relief and Coal Burst Prevention in Horizontal Sublevel Top Coal Caving Mining with Filling for Near-Vertical Coal Seams Group
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摘要: 摘要:针对近直立煤层群层间岩柱应力集中现象,提出一种水平分段综放开采充填卸压防冲方法。通过数值模拟,研究不同充填开采方案对于冲击地压的防治效果。结果表明,相比于无充填开采,层间岩柱区域应力集中区方案二,三,四较方案一分下降25.0534%,26.5237%,29.2254%的应力。下分段煤体高应力集中区,B3+6煤层较B1+2煤层卸压效果更明显,方案二,三,四较方案一分别下降10.6179%,10.7579%,12.3298%的应力。充填方案结合智能化监测手段建立智能调控系统,通过监测应力集中系数指导充填开采。研究结果可对近直立煤层群开采冲击地压问题提供参考。Abstract: 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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