近距离煤层群开采对相邻回采巷道的破坏特征及控制技术

Failure characteristics and control technology of adjacent mining roadways in close-distance coal seam group mining

  • 摘要: 【目的及方法】为了探究近距离煤层开采临近回采巷道变形破坏特征,以安徽任楼煤矿II8224工作面为研究对象,通过实验室相似模拟试验和现场矿压监测手段,分析了近距离煤层群开采对相邻回采巷道的影响及巷道破坏特征。【结果及结论】研究结果表明,在近距离煤层群模拟试验中,72煤层开采后,其采空区压实对下位煤层产生影响,煤柱成为应力集中和传递的媒介,从而影响下位煤层开采;8224工作面风巷受影响变形明显,伴随有显著的帮部剥落;针对8224风巷破坏形式提出相应的控制方案。

     

    Abstract: To investigate the deformation and failure characteristics of mining roadways adjacent to close-distance coal seam extraction, this study takes the II8224 working face of Renlou Coal Mine in Anhui Province as the research object. Through laboratory similar material simulation experiments and on-site mine pressure monitoring, the influence of close-distance coal seam group mining on adjacent mining roadways and their failure characteristics were analyzed. The results indicate that in the close-distance coal seam group simulation test, after the mining of the 72 coal seam, the compaction of its goaf affects the lower coal seam, with the coal pillar acting as a medium for stress concentration and transfer, thereby influencing the mining of the lower coal seam. The air roadway of the 8224 working face exhibited significant deformation under this influence, accompanied by pronounced rib spalling. Corresponding control measures were proposed based on the failure modes observed in the 8224 air roadway.

     

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