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Abstract Based on the briquets of the outburst coal seam of typical coal and gas outburst mine of Datong in Songzao Coal and Electricity Company，by means of self-developed triaxial gas-seepage experimental device，the experimental research of permeability of gas-bearing briquets in the complete stress-strain process is performed. The research results show as follows：if the gas pressure is fixed，the seepage velocity of briquets drops at first and rises later with increasing axial stress，and increases after peak stress. There is significant corresponding relationship between the complete stress-strain process curve and the seepage velocity-strain curve. The seepage velocity in peak stress decreases with the increase of confining pressure，and indicates obvious linear relationship. The comparative experiments in certain confining pressure and gas pressure show that rising confining pressure can decrease permeability of briquets and rising gas pressure can increase permeability of briquette specimens. The results have a referential value for using geostress field draining gas in coal bed and predicting deformations and failure of coal through gas emission.
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Received: 27 July 2009
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