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Abstract Based on the relationships of gas seepage speed with confining pressure and axial compression which are obtained by conventional triaxial test of gas seepage of outburst coal，the coupling relationship between the gas seepage speed and stress of outburst coal is discussed，and the relationships of gas seepage speed with confining pressure and axial compression with certain gas pressure are established and so is the equation of stress with seepage coefficients. The following results can be drawn. When the gas pressure and axial compression are determined，the gas seepage speed decreases as confining pressure increasing with the relationship of second-order curve relationship. When the gas pressure and confining pressure are determined，the relationship between the gas seepage speed and axial compression is fourth-order curve relationship，and the gas seepage speed of broken Briquette is larger than initial speed. A characteristic parameter，difficulty stress point of gas seepage，is proposed，which is useful for prevention of accidents of coal and gas Dutburst.
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Received: 11 July 2008
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