煤岩组合体层间作用效应及煤柱合理宽度研究

Study on Interlayer Interaction Effect of Coal-Rock Assemblage and Reasonable Width of Coal Pillar

以某矿3202工作面为研究背景,通过理论分析和数值模拟方法分析工作面煤岩组合结构护巷煤柱层间作用效应及不同煤柱宽度的应力位移分布规律。结果表明,当岩石强度大于煤体强度时,煤岩组合结构整体强度增强。此外,煤岩组合煤柱内部应力在煤岩交界面发生突变,随着煤柱宽度增加,煤柱内部垂直应力发生偏转,水平应力偏转程度最高。分析煤岩组合煤柱和单一煤柱的应力和位移规律,结果表明,组合煤柱的承载能力较大,巷道围岩稳定性好,与理论分析结果一致。

Taking 3202 working face of a coal mine as the research background, the interlayer interaction effect of coal pillar and stress displacement distribution of coal pillar with different width of coal pillar are analyzed by theoretical analysis and numerical simulation. The results show that when the strength of rock is greater than that of coal, the overall strength of coal-rock composite structure increases. In addition, the internal stress of coal-rock combined coal pillar changes suddenly at the coal-rock interface. With the increase of the width of coal pillar, the vertical stress in the coal pillar deflected, and the horizontal stress deflected the most. The stress and displacement laws of coal-rock combined coal pillar and single coal pillar are analyzed. The results show that the combined coal pillar has larger bearing capacity and better stability of roadway surrounding rock, which is consistent with the theoretical analysis results.