Aiming at the characteristic of poor permeability in the low permeability coal seam of China,based on the microscopic imaging of coal after the effect of supercritical CO_2,a three-dimensional reconstruction program was developed and a three-dimensional solid model was constructed by combining the image processing technology and the finite element method.Considering the influence on the permeability laws by the thermal damage effect of coal,the pore fluid flow and the effective stress,the damage variable wa...
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