巨厚砾岩下薄保护层开采应力控制防冲机理
Stress Control and Rock Burst Prevention Mechanism on Thin Protective Seam Mining Under Thick Gravel
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摘要: 以典型巨厚砾岩影响的冲击危险矿井为背景，运用理论分析和数值模拟相结合的方法，对薄煤层作为保护层开采的区域应力控制防冲机理及防冲效果进行分析研究。研究结果表明，在保护层与被保护层距离一定的前提下，被保护层的卸压梯度和范围与保护层的开采范围呈正比。保护层开采范围越大，上覆岩层内的高应力释放的空间越大，被保护层回采工作面及其区段煤柱仅承受本区段开采产生的采动应力，使“顶板-煤层”结构体处于低应力环境中，冲击地压得到控制。Abstract: Taking typical rock burst mine under thick gravel influence as background, using theoretical analysis and numerical simulation methods, the regional stress control rock burst prevention mechanism and effect that takes thin coal seam as protective seam mining is studied. The research finds that the pressure relief gradient and range have a direct ratio relation with the mining range of protective coal seam on the premise of that the protective layer and the protected layer located in a certain distance. The larger protective coal seam miming, the larger space of high stress released within the overburden, the surrounding rock and sectional coal pillars just bear mine-induced stress from protected coal seam mining, the "roof-seam" structure is in a low stress and the rock burst is controled.
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Keywords:
- rock burst /
- thick gravel /
- thin coal seam /
- protective seam /
- stress control
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