胡滨. 浅埋深厚煤层大采高工作面回撤通道留设技术研究[J]. 中国矿业,2023,32(11):137-143. DOI: 10.12075/j.issn.1004-4051.20230137
    引用本文: 胡滨. 浅埋深厚煤层大采高工作面回撤通道留设技术研究[J]. 中国矿业,2023,32(11):137-143. DOI: 10.12075/j.issn.1004-4051.20230137
    HU Bin. Study on retaining technology of retracement channel in large mining height working face of thick coal seam with shallow-buried depth[J]. China Mining Magazine,2023,32(11):137-143. DOI: 10.12075/j.issn.1004-4051.20230137
    Citation: HU Bin. Study on retaining technology of retracement channel in large mining height working face of thick coal seam with shallow-buried depth[J]. China Mining Magazine,2023,32(11):137-143. DOI: 10.12075/j.issn.1004-4051.20230137

    浅埋深厚煤层大采高工作面回撤通道留设技术研究

    Study on retaining technology of retracement channel in large mining height working face of thick coal seam with shallow-buried depth

    • 摘要: 为解决浅埋深厚煤层大采高工作面回撤通道留设难题,基于三种留设工艺方法的优缺点对比,理论分析了工作面煤壁前方支承压力影响下塑性区、弹性区范围及区域内应力分布状态。从煤壁表层向煤体深部延伸过程中,支承压力值先是呈指数函数形态递增变化至峰值,然后呈负指数函数形态最终递减至原岩应力状态,其中煤壁前方压力衰减区是布置回撤通道的最佳位置。现场应用表明大梁湾煤矿回采面超前支承压力峰值位于煤壁前方10.02 m,待设计停采线前末次基本顶周期来压后再向前推采5 m度过来压持续长度,在支承压力衰减区内选择“双机”配合自割回撤通道工艺,运用高预应力强力锚杆(索)支护系统配合液压支架护帮结构可以有效维护通道顶板稳定性,保证工作面设备回撤空间,为类似条件下工作面布设回撤通道提供工程借鉴。

       

      Abstract: In view of the problem of retaining the retracement channel in large mining height working face of thick coal seam with shallow-buried depth, the range of plastic zone, elastic zone and the stress distribution in the zones under the influence of abutment pressure in front of the coal wall of the working face are analyzed theoretically based on the comparison of the advantages and disadvantages of the three methods. During the extension process from the surface layer of the coal wall to the deep part of the coal body, the value of the abutment pressure in the leading region firstly increases to the peak value in the exponential function form, and then it finally decreases to the stress state of the original rock in the form of negative exponential function, and the pressure attenuation area in front of coal wall is the best position to arrange the retracement channel. Field application shows that the peak value of advanced abutment pressure is 10.02 m in the front of coal wall at Daliangwan Coal Mine. A further 5 m is extracted to pass the pressure duration after the last periodic weighting of the working face before the designed stop-mining line, and the self-cutting retracement channel process with two-machine coordination is adopted in the abutment pressure attenuation area. The stability of channel roof could be effectively maintained by using the combined support structures of the high pretension and intensive bolts and cables combines with the guard plates of the hydraulic support, and the space for the equipment retracement would be ensured. They could provide engineering references for the layout of the retracement channel under similar conditions.

       

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