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An effective method to enhance productivity of gas drainage wells in gas-bearing coal seams is hydraulic fracturing. Proppants are usually used in the hydraulic fracture to maintain its aperture, long conductivity and gas recovery from developed coal seams. In the paper the experimental results of gas permeability of the solid coal cores, coal specimens with non-propped and propped artificial longitudinal fractures are presented. The data were received for different stress conditions: effective stress varied from ...