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为解决西马煤矿北二采区村庄下压煤问题,对压煤区域进行合理开采以减小多煤层多次采动对地表影响。以村下采区12~#煤层地质条件为基础,应用压力拱理论确定村下压煤条带开采方案,并对条带煤柱采宽与留宽进行合理设计以保证煤柱获得长期安全性和稳定性。同时,应用FLAC~(3D)程序对开采区域地层稳定性进行数值模拟分析,揭示开采过程覆岩移动规律和蠕变变形特征。分析结果表明:随着时间的推移,地表沉降变形趋于稳定,设计开采区域采空区上覆岩层应力场分布重新达到平衡且整体处于稳定状态。
In order to solve the problem of coal pressing down in the villages of No.2 mining area in Xima Coal Mine, reasonable mining of coal in pressure area is carried out to reduce the influence of multiple mining on surface. Based on the geological conditions of 12 ~ # coal seams in mining area under village, the pressure arch theory was used to determine the mining scheme of pressure coal strips in the village, and the reasonable design of the width and width of strip coal pillars was adopted to ensure long-term safety of coal pillar And stability. At the same time, FLAC ~ (3D) program was used to simulate the stratum stability in the mining area to reveal the law of overlying strata movement and creep deformation during the mining process. The analysis results show that with the passage of time, the settlement of the ground surface tends to be stable, and the distribution of stress field in overlying strata in the mined area re-equilibrates and is in a stable state overall.