Open Access

ARTICLE

Numerical Investigation of the Effect of Sorption Time on Coal Permeability and Gas Pressure

Yi Xue^1,2,*, Faning Dang², Rongjian Li², Fei Liu³

1 State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China.
2 Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, China .
3 School of Resources and Civil Engineering, Suzhou University, Suzhou 234000, China .

*Corresponding Author: Yi Xue. Email: .

Computer Modeling in Engineering & Sciences 2018, 115(3), 345-358. https://doi.org/10.3970/cmes.2018.08052

Abstract

Adsorption deformation significantly affects the seepage characteristics of coal. However, effect of sorption time on coal permeability and gas pressure has not been investigated systematically. In this study, the sorption experiment of coal samples is conducted to elaborate the importance of sorption equilibration time. Then a coupled coal deformation and gas flow model is established considering the sorption characteristic and permeability evolution. This coupled model is implemented through finite element method to analyze the effect of sorption time on coal permeability and gas pressure. The simulation results reveal that the gas pressure of the coal will change with the adsorption time. The fracture pressure maintains a high level while the matrix pressure is relatively low during the adsorption process. The sorption time has a great influence on the distribution of gas pressure. The smaller the adsorption time is, the lower the gas pressure becomes.

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Keywords

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