Conversely, during the pore pressure decrease phase, while maintaining constant axial and confining pressures, the axial, radial, and volumetric strains of coal exhibit an increasing trend.
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Development and Experimental Analysis of Coalbed Permeability Model Considering Mechanical Properties and Gas Degradation Effects.
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In order to further investigate the influence law of the modified gas damage factor L on the permeability in the unloading process, the coefficients a and b in the modified function L ( p ) were analyzed for sensitivity, respectively. The fitted values of the parameters of L ( p ) under different axial and peripheral pressure conditions are shown in Table , and coefficient b shows a decreasing trend with the increase of axial and peripheral pressure.