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突出薄煤层中间巷掩护掘进消突技术研究

张楠 徐九洲 邱黎明

张楠,徐九洲,邱黎明. 突出薄煤层中间巷掩护掘进消突技术研究[J]. 工矿自动化,2022,48(3):40-46.  doi: 10.13272/j.issn.1671-251x.2021090023
引用本文: 张楠,徐九洲,邱黎明. 突出薄煤层中间巷掩护掘进消突技术研究[J]. 工矿自动化,2022,48(3):40-46.  doi: 10.13272/j.issn.1671-251x.2021090023
ZHANG Nan, XU Jiuzhou, QIU Liming. Research on outburst elimination technology of shield tunneling in middle roadway of outburst thin coal seam[J]. Journal of Mine Automation,2022,48(3):40-46.  doi: 10.13272/j.issn.1671-251x.2021090023
Citation: ZHANG Nan, XU Jiuzhou, QIU Liming. Research on outburst elimination technology of shield tunneling in middle roadway of outburst thin coal seam[J]. Journal of Mine Automation,2022,48(3):40-46.  doi: 10.13272/j.issn.1671-251x.2021090023

突出薄煤层中间巷掩护掘进消突技术研究

doi: 10.13272/j.issn.1671-251x.2021090023
基金项目: 国家自然科学基金项目(52004016);2021年度贵州省科技支撑计划项目(黔科合支撑 〔2021〕 515);山东省重大科技创新工程项目(2019SDZY02)。
详细信息
    作者简介:

    张楠(1987-),男,河南永城人,工程师,主要研究方向为矿井瓦斯灾害防治技术,E-mail:598018449@qq.com

    通讯作者:

    邱黎明(1991-),男,河南周口人,讲师,硕士研究生导师,主要研究方向为煤岩动力灾害防治与监测预警,E-mail:qiulm@ustb.edu.cn

  • 中图分类号: TD713

Research on outburst elimination technology of shield tunneling in middle roadway of outburst thin coal seam

  • 摘要: 为了解决薄煤层煤与瓦斯突出防治困难的问题,分析了薄煤层中有效抽采区域分布特征:由于受薄煤层厚度的限制,瓦斯抽采有效区域在垂直方向的扩展受阻,更倾向于在水平方向延伸,导致水平方向的有效抽采半径远大于煤层厚度,有效抽采区域呈椭圆形分布,瓦斯渗流场主要集中在煤层走向和倾向上。根据该特征,指出基于本煤层抽采方式的中间巷掩护掘进消突技术能使抽采区域连成一片,更适用于薄煤层瓦斯抽采。分析了将中间巷掩护掘进消突技术应用于薄煤层中进行分块消突的优势和技术原理:采用沿空留巷技术将上一工作面的回风巷作为下一工作面的进风巷;在进风巷向前施工瓦斯抽采钻孔,抽采范围覆盖并超前预定的中间巷20 m以上,通过瓦斯抽采消除中间巷的突出危险性;掘进中间巷;在中间巷向回风巷预定位置施工瓦斯抽采钻孔,抽采范围覆盖并超前预定的回风巷20 m以上,通过瓦斯抽采消除中间巷的突出危险性;最后对回风巷进行掘进,形成回采工作面。以某矿9305工作面薄煤层为研究对象进行数值模拟,结果表明:在抽采时间为10 d和30 d之间,有效抽采半径的增加幅度最大,随着抽采时间增加,有效抽采范围的增加幅度逐渐减小;钻孔间距为3 m时,两钻孔之间的有效抽采半径几乎相切,抽采效果最佳,抽采压力基本可以使大部分煤层瓦斯有效扩散、解析、被动抽采;对中间巷的瓦斯抽采有效降低了回风巷和递进中间巷区域之间的瓦斯压力。现场实测结果表明:9305工作面突出煤层中间巷掩护掘进的最优抽采钻孔间距为3 m,孔径为94 mm,有效抽采直径不超过5 m,钻孔深度为107 m;中间巷掩护掘进消突技术使得薄煤层瓦斯体积分数下降约70%,消突效果显著。

     

  • 图  1  普通煤层中的有效抽采半径

    Figure  1.  Effective drainage radius in common coal seam

    图  2  薄煤层中的有效抽采半径

    Figure  2.  Effective drainage radius in thin coal seam

    图  3  薄煤层中间巷抽采钻孔布置

    Figure  3.  Layout of extraction boreholes in middle roadway of thin coal seam

    图  4  薄煤层瓦斯抽采模型

    Figure  4.  Gas drainage model of thin coal seam

    图  5  不同抽采时间下薄煤层瓦斯压力分布

    Figure  5.  Gas pressure distribution in thin coal seams under different extraction time

    图  6  不同钻孔间距下薄煤层瓦斯压力分布

    Figure  6.  Gas pressure distribution in thin coal seam under different borehole spacing

    图  7  瓦斯压力三维分布切片

    Figure  7.  Three dimensional distribution slices of gas pressure

    图  8  9305工作面中间巷递进掩护掘进消突方案

    Figure  8.  The scheme of outburst elimination of progressive shield tunneling in middle roadway of 9305 working face

    图  9  回风巷本煤层抽采瓦斯体积分数变化

    Figure  9.  Variation of volume fraction of gas extracted from coal seam in return airway

    表  1  主要物理参数

    Table  1.   Main physical parameters

    名称数值
    初始瓦斯压力/MPa1.75
    灰分/%9.8
    吸附常数a/(m3·t−1)27.248
    吸附常数b/(MPa−1)1.12
    孔隙率/%5
    透气性系数/(m2·MPa−2·d−1)0.778
    瓦斯动力黏度/(Pa·s)1.84×10−5
    煤层密度/(t·m−3)1400
    透气率/m23.8×10−15
    水分/%1.5
    下载: 导出CSV
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  • 收稿日期:  2021-09-07
  • 修回日期:  2022-03-12
  • 网络出版日期:  2022-03-15

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