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<p>The propagation and development of fractures in coal are the primary factors controlling the permeability of coal seams. Using micro-CT and porous media fractal theory, the internal fracture network structures of coal samples formed under different loading conditions were characterized to investigate the influence of fracture fractal dimension and aperture on permeability. Based on the cubic law of fracture flow, a permeability calculation formula incorporating the fractal dimension and aperture was established. The calculated permeability was verified using a three-dimensional model simulation in AVIZO, with an error of 1.097%. The results show that the permeability of coal is closely related to the geometric characteristics of internal fractures. Compared with fracture quantity, the aperture and fractal dimension have a more significant effect on permeability. The larger the three-dimensional fractal dimension and the more uniform the distribution of the two-dimensional fractal dimension, the better the permeability of the samples. When the three-dimensional fracture fractal dimension ranges between 2.2 and 2.3, permeability is mainly influenced by fracture aperture. In addition, higher and more uniformly distributed initial porosity leads to greater fracture aperture and fractal dimension. The permeability analysis of coal fracture networks based on fractal theory provides theoretical support for coal seam water injection.</p>

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Study on seepage characteristics of coal fracture networks based on fractal theory and micro-CT

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Wenting Cui,
  • Yanbin Yu,
  • Weimin Cheng,
  • Jie Zang,
  • Zihao Yuan

摘要

The propagation and development of fractures in coal are the primary factors controlling the permeability of coal seams. Using micro-CT and porous media fractal theory, the internal fracture network structures of coal samples formed under different loading conditions were characterized to investigate the influence of fracture fractal dimension and aperture on permeability. Based on the cubic law of fracture flow, a permeability calculation formula incorporating the fractal dimension and aperture was established. The calculated permeability was verified using a three-dimensional model simulation in AVIZO, with an error of 1.097%. The results show that the permeability of coal is closely related to the geometric characteristics of internal fractures. Compared with fracture quantity, the aperture and fractal dimension have a more significant effect on permeability. The larger the three-dimensional fractal dimension and the more uniform the distribution of the two-dimensional fractal dimension, the better the permeability of the samples. When the three-dimensional fracture fractal dimension ranges between 2.2 and 2.3, permeability is mainly influenced by fracture aperture. In addition, higher and more uniformly distributed initial porosity leads to greater fracture aperture and fractal dimension. The permeability analysis of coal fracture networks based on fractal theory provides theoretical support for coal seam water injection.