Abstract：The mechanical behavior of coal adsorbing/desorbing methane is an important issue in the mechanism of coal and gas outburst. The sorption/desorption deformations of coal samples，from No. 9 coal seam in Zhaogezhuang Mine of Kailuan Mines，under different gas pressures of sorption were observed by means of the test system for sorption-induced strain. Using mercury intrusion porosimetry(MIP) and nitrogen adsorption(NA) methods，the reasons for strain differentia of coal samples were analyzed. The experimental results show that methane sorption/desorption results in anisotropic swelling/shrinkage，and it takes a long time for coal strain to stabilize. Coal shrinkage increases quickly at the start of desorption period，and then it increases slowly. Gas pressure of sorption is greater，the more significant shrinkage of coal deformation due to gas desorption. Micropore amount and pore continuity in the coal samples are the important factors that control coal sorption/desorption deformation，the strain rate and residual strain of coal shrinkage.
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2016, Vol. 35 
