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<p>Roof sandstone fissure water poses a significant threat to mine safety due to its concealed occurrence, discontinuous distribution, and poor drainage efficiency under traditional borehole pre-drainage methods. To address this challenge, this study analyzes the types and mechanisms of roof sandstone fissure water hazards and proposes a pulse hydraulic fracturing-assisted pre-drainage method for constructing artificial water-conducting channels. By installing drainage boreholes and applying high-frequency pulsed water-pressure, PHF generates dense, multi-directional fracture networks within the sandstone fissure aquifer, effectively connecting previously discontinuous water-bearing zones. This approach efficiently drains water from roof fissures into boreholes, significantly extending the effective drainage radius of a single borehole. Field tests conducted at the Ⅲ412 working face of Hengyuan Coal Mine demonstrated periodic water pressure fluctuations (15–33&#xa0;MPa), with dense axial and circumferential fracture networks formed on borehole walls and fracture propagation distances of 15–30&#xa0;m. The variation curve of the water outflow rate from the boreholes after pulse hydraulic fracturing is divided into a sharp increase stage, an attenuation stage, and a stable stage. The maximum water outflow rate of a single borehole is 5 m<sup>3</sup>/h. The maximum volume of water spared from a single borehole within 72&#xa0;h was 226.12 m<sup>3</sup>. Variations in drainage volume before and after fracturing effectively characterized the water abundance features of the regional aquifer. This technology offers technical and economic advantages for the efficient drainage of water from the sandstone aquifer and also serves as a tool for mine pressure management.</p>

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Construction of artificial water conduit by pulse hydraulic fracturing for water pre-drainage in roof fissured sandstone aquifer

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • Xinglong Zhao,
  • Bingxiang Huang,
  • Zhipeng Wei,
  • Binghong Li,
  • Siyuan Niu

摘要

Roof sandstone fissure water poses a significant threat to mine safety due to its concealed occurrence, discontinuous distribution, and poor drainage efficiency under traditional borehole pre-drainage methods. To address this challenge, this study analyzes the types and mechanisms of roof sandstone fissure water hazards and proposes a pulse hydraulic fracturing-assisted pre-drainage method for constructing artificial water-conducting channels. By installing drainage boreholes and applying high-frequency pulsed water-pressure, PHF generates dense, multi-directional fracture networks within the sandstone fissure aquifer, effectively connecting previously discontinuous water-bearing zones. This approach efficiently drains water from roof fissures into boreholes, significantly extending the effective drainage radius of a single borehole. Field tests conducted at the Ⅲ412 working face of Hengyuan Coal Mine demonstrated periodic water pressure fluctuations (15–33 MPa), with dense axial and circumferential fracture networks formed on borehole walls and fracture propagation distances of 15–30 m. The variation curve of the water outflow rate from the boreholes after pulse hydraulic fracturing is divided into a sharp increase stage, an attenuation stage, and a stable stage. The maximum water outflow rate of a single borehole is 5 m3/h. The maximum volume of water spared from a single borehole within 72 h was 226.12 m3. Variations in drainage volume before and after fracturing effectively characterized the water abundance features of the regional aquifer. This technology offers technical and economic advantages for the efficient drainage of water from the sandstone aquifer and also serves as a tool for mine pressure management.