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Coalbed methane is undergoing vast challenges in the exploration and production process, especially the degasification in low permeability of coal seams with the highest gas concentrations. Enhancing the permeability of soft coal seam should be emphasized. In present work, the field tests on presplitting and blasting technology with deep boreholes have been conducted, besides the permeability variations, including the gas extraction concentration and purity of low permeability coal seam, havedoi:10.1088/1755-1315/300/2/022015 fatcat:lx63uiiusffyrcll2utx5k5fv4