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基于底板岩巷全生命周期瓦斯治理技术研究

翟成 唐伟

翟成,唐伟. 基于底板岩巷全生命周期瓦斯治理技术研究[J]. 工矿自动化,2023,49(6):95-103, 167.  doi: 10.13272/j.issn.1671-251x.18121
引用本文: 翟成,唐伟. 基于底板岩巷全生命周期瓦斯治理技术研究[J]. 工矿自动化,2023,49(6):95-103, 167.  doi: 10.13272/j.issn.1671-251x.18121
ZHAI Cheng, TANG Wei. Research on full-life cycle gas treatment technology based on floor rock roadway[J]. Journal of Mine Automation,2023,49(6):95-103, 167.  doi: 10.13272/j.issn.1671-251x.18121
Citation: ZHAI Cheng, TANG Wei. Research on full-life cycle gas treatment technology based on floor rock roadway[J]. Journal of Mine Automation,2023,49(6):95-103, 167.  doi: 10.13272/j.issn.1671-251x.18121

基于底板岩巷全生命周期瓦斯治理技术研究

doi: 10.13272/j.issn.1671-251x.18121
基金项目: 国家杰出青年科学基金项目(51925404)
详细信息
    作者简介:

    翟成(1979—),男,山东滕州人,教授,博士,主要研究方向为矿井瓦斯抽采及灾害防治,E-mail:greatzc@cumt.edu.cn

  • 中图分类号: TD712

Research on full-life cycle gas treatment technology based on floor rock roadway

  • 摘要: 对于缺乏开采保护层条件的矿井,底板岩巷条带预抽煤层瓦斯是主流瓦斯治理方法。分析指出底板岩巷在实际应用中存在空间层位选择差异较大、 穿层冲孔致煤巷围岩稳定性差、底板岩巷掘进造价高且利用效率低等问题。以底板岩巷为基础,考虑整个煤炭生产过程中的瓦斯问题,提出了基于底板岩巷全生命周期瓦斯治理技术,形成了“层位优选−穿层冲孔−穿层注浆−采动抽采−矸石回填”五位一体的瓦斯综合治理模式。以首山一矿为例,通过测定采煤工作面地层的岩石力学性质,基于数值方法分析了巷道掘进和工作面回采条件下底板岩巷的稳定性,根据围岩损伤特征和采动围岩应力分布,确定了将底板岩巷布置在采煤工作面运输巷下部16 m、与上部运输巷内错1 m位置。对底板岩巷穿层水力冲孔钻孔布置进行优化,设定了组间距6.4 m、每组按单双号交错打孔的方案,通过测定水力冲孔钻孔残余瓦斯压力得出水力冲孔有效影响范围超过4 m,钻孔瓦斯浓度较高、衰减较慢,条带预抽效果良好。通过穿层注浆技术改善上部破碎煤体性质,钻孔窥探显示经过穿层注浆加固后的煤体强度提高、破碎程度降低,巷帮变形量监测结果表明巷道围岩整体稳定性较好、煤层强度提高,钻屑量监测结果表明注浆加固范围超过5 m,有效降低了巷道掘进的突出危险性。通过底板岩巷穿层钻孔,对工作面回采期间采动卸压瓦斯进行抽采,发现采动有效影响范围为采煤工作面前方50 m,采动影响区内瓦斯抽采效果良好,采煤工作面风流瓦斯体积分数降低至0.45%以下,有效降低了采煤工作面瓦斯浓度。回采结束后,设计了底板岩巷矸石回填方法,以降低矸石出井成本,提高巷道利用效率。

     

  • 图  1  基于底板岩巷全生命周期瓦斯治理技术

    Figure  1.  Full-life cycle gas treatment technology based on floor rock roadway

    图  2  地层取样及力学性质测定

    Figure  2.  Stratigraphic sampling and mechanical property determination

    图  3  数值模型

    Figure  3.  Numerical models

    图  4  巷道掘进围岩稳定性数值与实际结果

    Figure  4.  The numerical and actual results of surrounding rock stability after roadway excavation

    图  5  工作面回采过程中底板受影响区域

    Figure  5.  Influenced area of floor during working face mining

    图  6  水力冲孔钻孔布置

    Figure  6.  Layout of hydraulic punching boreholes

    图  7  残余瓦斯压力测定孔

    Figure  7.  Residual gas pressure determination boreholes

    图  8  钻孔瓦斯压力变化

    Figure  8.  Change of borehole gas pressure

    图  9  钻孔瓦斯浓度变化

    Figure  9.  Gas concentration change of boreholes

    图  10  穿层注浆加固

    Figure  10.  Through-layer grouting reinforcement

    图  11  钻孔窥探

    Figure  11.  Borehole peeping

    图  12  煤层内钻孔内壁窥探结果

    Figure  12.  Peeping results of inner wall of boreholes in coal seam

    图  13  巷道变形量

    Figure  13.  Roadway deformation

    图  14  巷道掘进煤体破碎钻屑量分布

    Figure  14.  Distribution of drill cuttings of broken coal body in excavation roadway

    图  15  采动瓦斯穿层抽采

    Figure  15.  Gas extraction through layers during mining

    图  16  采煤工作面前方钻孔瓦斯浓度分布

    Figure  16.  Gas concentration distribution in boreholes in front of mining face

    图  17  动压区瓦斯抽采量占比

    Figure  17.  Percentage of gas extraction in mining-influenced area

    图  18  风流瓦斯浓度变化

    Figure  18.  Change of gas concentration in airflow

    图  19  矸石回填仿真结果

    Figure  19.  Simulation results of gangue backfill

    表  1  岩石力学参数

    Table  1.   Rock mechanics parameters

    岩层静态抗压强度巴西拉伸强度
    实验值/
    MPa
    模拟值/
    MPa
    误差/%实验值/
    MPa
    模拟值/
    MPa
    误差/%
    中砂岩102.8105.52.68.48.62.4
    砂质泥岩44.646.23.54.34.14.7
    中砂岩78.177.50.87.27.11.4
    泥岩52.551.51.93.93.67.7
    6.36.21.61.81.75.6
    细砂岩63.662.12.49.49.22.1
    泥灰岩44.346.44.75.25.03.8
    煤线6.36.21.61.81.75.6
    泥灰岩36.133.57.24.13.94.9
    石灰岩138.1140.51.79.79.92.1
    下载: 导出CSV

    表  2  水力冲孔钻孔施工参数

    Table  2.   Construction parameters of hydraulic punching boreholes

    钻孔水平角/(°)见煤点/m孔深/m
    1号上帮2427.846.3
    2号上帮3120.434.2
    3号上帮4114.825.1
    4号上帮5511.018.8
    5号上帮758.715.1
    6号上帮858.014.0
    7号下帮668.514.8
    8号下帮4610.518.2
    9号下帮3114.224.3
    10号下帮2119.633.1
    11号下帮1426.844.8
    12号下帮1036.160.0
    下载: 导出CSV

    表  3  设备选型

    Table  3.   Equipment selection

    序号设备/工具名称型号/规格
    1局部通风机2BKJNO6.3/2X30
    2推车机TLL6−1
    3带式输送机SSJ−800
    4刮板输送机GW−40T
    5胶带转载机EZQ−300
    6抛矸机CTS37.5/83
    7回柱绞车JH−14
    8铁锹普通
    9撬棍2 m
    10大锤10
    11翻车机FDZY−1.0/6
    12给料机JDG/5.5/F/B−Ⅱ
    下载: 导出CSV
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  • 收稿日期:  2023-05-09
  • 修回日期:  2023-06-06
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