A MULTI-FIELD COUPLED SEEPAGE MODEL FOR COAL SEAM WITH FRACTURES OF POWER LAW LENGTH DISTRIBUTIONS

Guannan Liu, Yuhao Hu, Boming Yu, Feng Gao, Fengtian Yue and Tao Gao
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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

FRACTALS (fractals), 2021, vol. 29, issue 06, 1-9

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.

Keywords: Power Law; Coal Seam; Permeability; Multi-Field Coupling Model; Fractal (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0218348X21501401

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