微观裂隙煤体电传导特性数值模拟研究

    Numerical simulation on electrical conductivity characteristics of micro-fractures coal body

    • 摘要: 提高煤层渗透性是提升瓦斯抽采效率的关键,而煤岩裂隙网络作为瓦斯的主要渗流通道,其结构特征直接影响煤岩渗透率,导致煤体表现出不同的电传导特性。本文基于山西焦煤霍尔辛赫煤矿实际工况,对机械造穴增透后的煤岩开展CT扫描实验,精确提取并量化裂隙结构参数,结合Avizo-COMSOL数据交互技术,模拟微观尺度下裂隙煤体电传导特性。研究结果表明:Z轴方向上电传导模拟结果表明随渗流距离增加,电势和压力呈均匀下降趋势,而渗流速度受孔隙结构的复杂性影响先减小后增大,电流密度则表现为先增大后减小。该研究成果可为我国深部致密煤层气开发及瓦斯灾害防控提供理论支持与工程指导。

       

      Abstract: Enhancing coal seam permeability is crucial for improving gas extraction efficiency, as the structural characteristics of the coal rock fissure network, being the primary seepage channel for gas, directly influence permeability. In this paper, based on the actual working conditions of Shanxi Huoerxinhe Coal Mine, CT scanning experiments are conducted on coal rock after mechanical cavitation and permeability enhancement to accurately extract and quantify fracture network structural parameters. These data are then integrated with Avi-zo-COMSOL data interaction technology to simulate the electrical conduction characteristics at the microscopic scale. The results indicate that, simulation results of gas seepage and electrical conduction along the Z-axis show that electric potential and pressure exhibit a uniform decreasing trend with increasing seepage distance. Meanwhile, seepage velocity initially decreases before increasing due to the complexity of the pore structure, while current density first increases and then decreases. These findings provide theoretical support and engineering insights for coalbed methane development and gas hazard prevention and control.

       

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