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Abstract Taking the raw coal samples of Zhaogu mine in Jiaozuo as a object of study，with a self-developed equipment for thermo-fluid-solid-stress coupling of coal containing methane，experimental studies of the relationship between the coal sample permeability and effective stress as well as the motion law of gas in the coal samples are conducted on the basis of considering the adsorption deformation，pore gas compression volume and temperature expansion. Relationship equation between loaded coal permeability and effective stress and motion equation which describes the nonlinear seepage law of coal seam gas have been established. Results show that：(1) Permeability represents nonlinear decreasing relationship with increasing effective stress，possessing the law of negative exponent；(2) The gas transfusion law under different pore barometric gradients in fixed confining pressure and axial compression is studied，and gas seepage velocity presents nonlinear under the action of coal transformation. Meanwhile，through fitting the experimental data with equation，it can been seen by relevance that test results are consistent with fitting results，which indicates that the established motion equation and method are reasonable.
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Received: 27 November 2012
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2014, Vol. 33 
