近距离煤层群窄煤柱下应力分布及巷道布置

    Stress distribution and roadway layout under narrow coal pillars in close coal seam group

    • 摘要: 针对近距离煤层群窄煤柱下的应力分布及巷道布置问题,采用理论分析、数值模拟及现场实测等方法对窄煤柱下部煤岩层的应力分布特征进行分析。研究表明:受相邻工作面顺序回采的影响,煤柱上覆岩层向后回采工作面侧回转,导致支承应力峰值向后回采工作面一侧偏移,煤柱支承应力呈不对称分布;受支承应力影响,煤柱下部煤岩层应力分布表现出与支承应力对应的不对称性,不对称程度随煤柱宽度的减小而升高。结合实际工程案例,根据下部煤层底板垂直应力及主应力差分布,同时考虑到应力不对称分布的影响,最终确定了下部煤层回采巷道位置。

       

      Abstract: Aiming at the stress distribution and roadway layout problems under the narrow coal pillars in close distance coal seam group, theoretical analysis, numerical simulation and field measurement are used to analyze the stress distribution characteristics of the coal strata under the narrow coal pillars. Studies have shown that, affected by the sequential mining of adjacent working faces, the overlying rock layer of the coal pillar revolves toward the back of the working face, which causes the peak support stress to shift to the side of the back mining face, and the supporting stress of the coal pillars is distributed asymmetrically; affected by the supporting stress, the stress distribution of the coal strata under the coal pillar shows asymmetry corresponding to the supporting stress, and the degree of asymmetry increases with the decrease of the coal pillar width. Combined with actual engineering cases, according to the distribution of the vertical stress and principal stress difference of the lower coal seam floor, and taking into account the influence of the asymmetric distribution of stress, the location of the mining roadway in the lower coal seam is finally determined.

       

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