TY - EJOU AU - Xue, Yi AU - Dang, Faning AU - Li, Rongjian AU - Liu, Fei TI - Numerical Investigation of the Effect of Sorption Time on Coal Permeability and Gas Pressure T2 - Computer Modeling in Engineering \& Sciences PY - 2018 VL - 115 IS - 3 SN - 1526-1506 AB - 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. KW - Permeability KW - porosity KW - gas pressure KW - adsorption time DO - 10.3970/cmes.2018.08052