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A Multi-Field Coupled Seepage Model For Coal Seam With Fractures Of Power Law Length Distributions

Author

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  • GUANNAN LIU

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China‡Laboratory of Mine Cooling and Coal-Heat Integrated Exploitation, China University of Mining and Technology, Xuzhou 221116, P. R. China)

  • YUHAO HU

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China§Mechanics and Civil Engineering Institute, China University of Mining and Technology, Xuzhou 221116, P. R. China)

  • BOMING YU

    (��School of Physics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China)

  • FENG GAO

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China§Mechanics and Civil Engineering Institute, China University of Mining and Technology, Xuzhou 221116, P. R. China)

  • FENGTIAN YUE

    (��Laboratory of Mine Cooling and Coal-Heat Integrated Exploitation, China University of Mining and Technology, Xuzhou 221116, P. R. China§Mechanics and Civil Engineering Institute, China University of Mining and Technology, Xuzhou 221116, P. R. China)

  • TAO GAO

    (��Laboratory of Mine Cooling and Coal-Heat Integrated Exploitation, China University of Mining and Technology, Xuzhou 221116, P. R. China§Mechanics and Civil Engineering Institute, China University of Mining and Technology, Xuzhou 221116, P. R. China)

Abstract

In the process of gas mining, the fracture distribution with power law length and the pore structure with adsorption effect have an important influence on the coal seam permeability. In recent years, the research on the internal structure of coal seam and the fluid flow mechanism has attracted a large number of researchers. In this paper, by considering the coal matrix deformation caused by adsorption, a pore-fracture model coupled with the multi-field effects and with power law length distribution of fractures in coal seam is established based on the fractal theory for porous media. In this work, we study the influences of the power law exponent α of fracture length and the ratio r of the minimum to maximum fracture lengths on the permeability of coal seam and the evolution mechanism of permeability with the structural and mechanical parameters of coal seam. It is found that the permeability of coal seam is inversely proportional to α, directly proportional to r, and to Langmuir volume constant and Langmuir volume strain constant. Compared with other factors, the power law component α of fractures has the most significant effect on the coal seam permeability.

Suggested Citation

  • Guannan Liu & Yuhao Hu & Boming Yu & Feng Gao & Fengtian Yue & Tao Gao, 2021. "A Multi-Field Coupled Seepage Model For Coal Seam With Fractures Of Power Law Length Distributions," FRACTALS (fractals), World Scientific Publishing Co. Pte. Ltd., vol. 29(06), pages 1-9, September.
    • Handle: RePEc:wsi:fracta:v:29:y:2021:i:06:n:s0218348x21501401
    DOI: 10.1142/S0218348X21501401
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