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煤层顶板承压含水层涌水模式与疏放水钻孔优化设计

虎维岳 姬亚东 黄欢

虎维岳, 姬亚东, 黄欢. 煤层顶板承压含水层涌水模式与疏放水钻孔优化设计[J]. 煤田地质与勘探, 2021, 49(5): 139-146. doi: 10.3969/j.issn.1001-1986.2021.05.015
引用本文: 虎维岳, 姬亚东, 黄欢. 煤层顶板承压含水层涌水模式与疏放水钻孔优化设计[J]. 煤田地质与勘探, 2021, 49(5): 139-146. doi: 10.3969/j.issn.1001-1986.2021.05.015
HU Weiyue, JI Yadong, HUANG Huan. Mine water inflow modes and scientific design of drainage boreholes in roof confined aquifer of coal seam[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(5): 139-146. doi: 10.3969/j.issn.1001-1986.2021.05.015
Citation: HU Weiyue, JI Yadong, HUANG Huan. Mine water inflow modes and scientific design of drainage boreholes in roof confined aquifer of coal seam[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(5): 139-146. doi: 10.3969/j.issn.1001-1986.2021.05.015

煤层顶板承压含水层涌水模式与疏放水钻孔优化设计

doi: 10.3969/j.issn.1001-1986.2021.05.015
基金项目: 

国家重点研发计划项目 2017YFC0804100

详细信息
    通信作者:

    虎维岳,1963年生,男,甘肃镇原人,博士,研究员,博士生导师,从事矿井水害防治技术研究与应用工作. E-mail:huweiyue@cctegxian.com

  • 中图分类号: TD742; TD745

Mine water inflow modes and scientific design of drainage boreholes in roof confined aquifer of coal seam

  • 摘要: 针对煤层顶板承压含水层涌水模式不清的问题,从煤层回采过程中顶板含水层涌水的时空变化特征入手,提出顶板含水层涌水量由静态储存量和动态补给量构成,认为静态储存量主要受来压步距、顶板垮落和导水裂隙(合称冒裂)影响区含水层厚度、含水层给水度控制,动态补给量主要受冒裂影响区外围含水层厚度、渗透性流场中水力梯度和过水断面面积控制;根据导水裂隙波及含水层情况,将顶板含水层涌水模式划分为井底进水的触及井涌水、井壁及井底进水的非完整井涌水和井壁进水的完整井涌水3种模式,并基于地下水渗流理论给出不同涌水模式下动态补给水量计算公式;针对以往疏放水钻孔数量多及疏放水量大的问题,以实现工作面顶板含水层静态储存量疏放后动态补给量可控为目的,提出冒裂区高度控制钻孔深度、单孔水位影响半径控制钻孔布置间距、钻孔疏放水量稳定时间控制超前疏放时间的疏放水钻孔优化设计理念,对疏放水及疏放钻孔布置进行优化,形成系统的顶板含水层水疏放体系。研究结果丰富了煤层顶板含水层涌水量计算和控制方法,对顶板水害防控具有实际的指导意义。

     

  • 图  1  顶板含水层静态储存量周期性释放

    Fig. 1  Schematic diagram of periodic release of static storage of roof aquifers

    图  2  顶板含水层动态补给量过水断面

    Fig. 2  Cross section of dynamic recharge of roof aquifers

    图  3  顶板含水层涌水模式

    Fig. 3  Schematic diagram of water-inflow pattern of roof aquifers

    图  4  井底进水的径向半球状触及井流

    Fig. 4  Radial semi spherical of bottom intake of infiltration well

    图  5  井底及井壁进水的径向二维–半球状非完整井流

    Fig. 5  Partially penetrated well of radial two-dimensional semispherical sphere with bottom and shaft wall intake

    图  6  井壁进水的径向二维完整井流

    Fig. 6  Fully penetrating well of radial two-dimensional with shaft wall intake

    图  7  随采空区面积的增加顶板含水层流场变化

    Fig. 7  Flow field variation of roof aquifers with the increase of goaf area

    图  8  疏放水量随时间变化

    Fig. 8  Schematic diagram of quantity of drainage varies with time

    图  9  工作面有无预疏放涌水量对比

    Fig. 9  Contrast diagram of water inflow whether drainage in advance or not

    图  10  疏放水量主要构成随时间变化

    Fig. 10  Composition of water drainage varies with time

    图  11  疏放水钻孔揭露含水层深度

    Fig. 11  Schematic diagram of drainage boreholes revealing the depth of aquifer

    图  12  疏放水钻孔影响半径叠加

    Fig. 12  Schematic diagram of superposition of influence radius of drainage boreholes

    图  13  顶板含水层水疏放体系

    Fig. 13  System of drainage of roof aquifers

    图  14  工作面疏放水量及含水层水位变化曲线

    Fig. 14  Schematic diagram of water flowage and the aquifer level

    表  1  陕北某矿工作面顶板水疏放情况统计

    Table  1  Statistics of roof water drainage of a mine working face in northern Shaanxi

    工作面 钻孔数量 累计疏放水时间/月 累计疏放水量/万m3
    31103 66 18.3 184.3
    31104 55 18.5 201.6
    31105 146 21.4 1 978.5
    31107 57 21.9 367.5
    31201 127 15.3 778.5
    31202 73 17.6 590.0
    31203 120 18.0 867.0
    31401 146 25.5 706.2
    平均 99 20.0
    下载: 导出CSV
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  • 收稿日期:  2021-05-13
  • 修回日期:  2021-07-06
  • 刊出日期:  2021-10-25
  • 网络出版日期:  2021-11-06

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