遗留煤柱下近距离特厚煤层临空掘巷合理煤柱尺寸

    Reasonable coal pillar size of gob-side entry driving under residual coal pillar in short distance and extra-thick coal seam

    • 摘要: 选择合理的护巷煤柱尺寸是临空掘巷成功和安全的前提;以某矿30503工作面为背景,采用理论分析、数值模拟和现场实践相结合的方法,对上覆遗留煤柱和本煤层相邻采空区条件下临空掘巷区段煤柱的合理尺寸进行了研究。结果表明:通过理论分析遗留煤柱沿底板应力变化规律,确定区段煤柱留设尺寸范围应在7~10 m之间;运用数值模拟分析了不同煤柱宽度条件下临空巷道煤柱应力和变形破坏规律,综合理论分析和数值模拟得出留8 m煤柱合适。现场监测结果表明,留8 m煤柱时,临空巷道顶板最大变形量为359 mm,两帮变形量为66 mm,巷道围岩变形稳定,能够满足现场实际生产要求。

       

      Abstract: Selecting reasonable coal pillar size is the premise of success and safety of gob side entry driving. Taking 30503 working face of a coal mine as the background, the reasonable size of narrow coal pillar in gob driving roadway under the condition of overlying residual coal pillar and adjacent goaf of the coal seam is studied by using the methods of theoretical analysis, numerical simulation and field practice. Results have shown that: through theoretical analysis of the stress change law of the remaining coal pillars along the floor, it is determined that the size range of the narrow coal pillars should be between 7 m and 10 m; numerical simulation is used to analyze the stress, deformation and failure law of coal pillar under different widths of coal pillar. Comprehensive theoretical analysis and numerical simulation show that 8 m coal pillar is suitable. Field monitoring results show that when 8 m coal pillars are left, the maximum deformation of the roof of the goaf roadway is 359 mm, the deformation of the two sides is 66 mm, and the surrounding rock deformation of the roadway is stable, which can meet the actual production requirements on site.

       

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