Permeability Model Sets Based on REV Strains and the Mesoscale Deformation Law of Coal and Sensitivity Analysis of Key Parameters.

For the CMW model set, the sensitivities of the bulk modulus and the fracture bulk modulus are consistent and similar to the adsorption strain coefficient, with highly significant sensitivities for all three parameters; in the CLE model set, the sensitivities of the fracture bulk modulus and the internal swelling coefficient are highly significant.

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The permeability mainly depends on the changing law of VSRF, and in the experiment, the permeability of gases with strong adsorption capacity (e.g., CH 4 and CO 2 ) usually shows a decreasing trend in the low-pressure region and an increasing trend in the high-pressure region, which is due to the fact that VSRF is negative in the low-pressure region and positive in the high-pressure region.

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