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主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
近距离煤层群煤柱下开采动压巷道围岩变形规律及控制
  • Title

    Deformation law and control of surrounding rock of dynamic pressure roadway under coal pillar in close seam group

  • 作者

    王伟弓仲标

  • Author

    WANG Wei;GONG Zhongbiao

  • 单位

    国能神东煤炭大柳塔煤矿

  • Organization
    Daliuta Coal Mine, CHN Energy Shendong Coal Group
  • 摘要
    煤柱下动压巷道围岩变形及控制是近距离煤层开采面临的主要技术难题。近距离煤层开采中,上煤层遗留煤柱在底板中产生的应力集中会直接影响到下部煤层巷道的围岩的完整性。此外邻近工作面回采时产生的侧向支承压力,将进一步破坏集中煤柱下巷道围岩稳定性,造成巷道帮鼓、底鼓甚至顶板下沉。本研究综合运用理论分析了上覆煤柱影响范围和侧向支承压力影响下巷道的合理布置位置,模拟了不同护巷煤柱宽度条件下,巷道应力分布规律和工作面前后各20 m范围内应力分布规律。结果表明:22314回风巷与上方煤柱错距大于13.3 m时,可避开上覆煤柱的影响,但巷道仍处于侧向支承压力影响范围内;随着护巷煤柱宽度增大,巷道的顶底板产生了垂直应力减小的区域,两帮也均产生了垂直应力升高的区域。工作面前方20 m范围内回风巷道垂直应力和剪应力沿巷道两侧呈非对称分布;后方20 m范围内巷道两侧垂直应力和剪应力基本呈对称分布,且剪应力对巷道顶板影响大于巷帮。基于以上分析,现场通过优化巷道设计、补强巷道支护、在巷道超前区域副帮施工大直径卸压钻孔以及回风巷三角区悬顶控制等,使回风巷围岩变形得到有效控制。研究结果对近距离煤层中下层煤不同位置受上煤层煤柱集中应力与动压影响巷道的围岩压力、破坏特征及稳定性控制具有一定的理论和应用意义,可为类似回采条件提供借鉴。
  • Abstract

    Surrounding rock deformation and control of dynamic pressure roadway under coal pillar is the main technical problem of close distance coal seam mining. In the mining of close distance coal seams, the stress concentration caused by the remaining coal pillars in the upper coal seam will directly affect the integrity of the surrounding rock of the lower coal seam roadway. In addition, the lateral abutment pressure produced by the mining of adjacent working face will further destroy the stability of roadway surrounding rock under concentrated coal pillar, resulting in roadway side heave, floor heave and even roof subsidence. In this paper, the influence range of overlying coal pillar and the reasonable layout position of roadway under the influence of lateral abutment pressure are analyzed theoretically. The stress distribution law of roadway and the stress distribution law in the range of 20m before and after working face are simulated under different widths of coal pillar. The results show that when the stagger distance between the 22314 return airway and the upper coal pillar is greater than 13.3 m, the influence of the overlying coal pillar can be avoided, but the roadway is still within the influence range of lateral abutment pressure. With the increase of the width of the coal pillar, the vertical stress decreases in the roof and floor of the roadway, and the vertical stress increases in both sides. The vertical stress and shear stress of the return airway within 20 m in front of the working face are asymmetrically distributed along both sides of the roadway. The vertical stress and shear stress on both sides of the roadway are basically symmetrically distributed within 20 m behind the roadway, and the influence of shear stress on the roof of the roadway is greater than that on the side of the roadway. Based on the above analysis, the deformation of the surrounding rock is effectively controlled by optimizing the roadway design, reinforcing the roadway support, constructing large-diameter pressure relief boreholes in the auxiliary side of the roadway in the advanced area and controlling the hanging roof in the return triangle area. The research results have certain theoretical and application significance for the surrounding rock pressure, failure characteristics and stability control of the roadway affected by the concentrated stress and dynamic pressure of the upper coal pillar at different positions of the middle and lower coal seams in the close distance coal seams, which can provide reference for similar mining conditions.

  • 关键词

    近距离煤层开采煤柱围岩变形数值模拟应力分布

  • KeyWords

    Close-range coal seam mining;coal pillar;deformation of surrounding rock;numerical simulation;stress distribution

  • DOI
  • 引用格式
    王伟,弓仲标.近距离煤层群煤柱下开采动压巷道围岩变形规律及控制[J].煤炭科学技术,2022,50(S2):143-152.DOI:10.13199/j.cnki.cst.2022-2089.
  • Citation
    WANG Wei,GONG Zhongbiao. Deformation law and control of surrounding rock of dynamic pressure roadway under coal pillar in close seam group[J]. Coal Science and Technology,2022,50(S2):143−152
  • 图表
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    • 22314工作面综合柱状图

    图(13) / 表(0)

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