Volume 49 Issue 5
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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
shu

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

  • 1.

    Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China

  • 2.

    Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi'an 710077, China

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  • Received Date: May 12, 2021
  • Revised Date: July 05, 2021
  • Available Online: November 05, 2021
  • Published Date: October 24, 2021
    Graphical Abstract
    • Abstract
  • Aiming at the uncertainty of mine water inflow mode, this paper analyzes the spatiotemporal variation characteristics of mine water inflow at first, and get a conclusion that the mine water is composed of static storage and dynamic recharge. And the static storage is mainly affected by weighting interval, the aquifer thickness of caving and fracture zone height and specific yield; the dynamic recharge is mainly affected by caving and fracture zone height and specific yield, hydraulic gradient in permeable flow field and discharge section area. According to the spatial relationships between water conducted fissure and roof aquifer of coal seam, the mine water inflow mode is classified into 3 types: partially penetrating well with water entering from well bottom, partially penetrating well with water entering from well bottom and wall, and completely penetrating well with water entering from well wall. And then the different calculation formulas of dynamic recharge for three mine water inflow modes are given based on groundwater seepage theory. For the large quantity drainage boreholes and excess quantity drainage, the optimal design concept of drainage borehole is proposed, which consists of caving and fracture zone height controlling boreholes depth, influence radius of single hole controlling borehole layout, and stable time of drainage controlling advanced drainage time, so as to optimize the layout of drainage water and drainage borehole, and establish the system of drainage of roof aquifers. The results offer an alternative for the scientific connotation of calculus formula and control methods for mine roof water inflow, which has practical guiding significance for prevention and control of mine roof water disaster.
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