EXPERIMENTAL STUDY OF GAS PERMEABILITY OF OUTBURST COAL BRIQUETTES IN COMPLETE STRESS-STRAIN PROCESS
(1.College of Resource and Environmental Sciences，Chongqing University，Chongqing 400030，China；2. Key Laboratory for the Exploitation of Southwest Resources and the Environmental Disaster Control Engineering of Ministry of Education，Chongqing University，Chongqing 400030，China)
Abstract：Based on the briquette specimens of the outburst coal seam K1 of typical coal and gas outburst mine of Sanhui a mine of Tianfu Coal Industry Co.，Ltd. in Chongqing，the experimental study of gas seepage law of outburst coal briquettes in complete stress-strain process under continuous loading is conducted by fluid-solid-heat coupling with triaxial servo-controlled seepage system of coal containing gas. The study results show that gas flow is tightly related with the damage deformation of the outburst coal briquettes during the complete stress-strain process. Gas flow firstly decreases gradually with the increase in axial strain，but it starts to rise after the yielding point of the complete stress-strain process of outburst coal briquettes；and the increasing rate of gas flow also enlarges after the peak point. On the other hand，the gas flow decreases primarily when the coal sample is volume compressed and then reverses to increase after the sample starts on dilatancy. The increasing range of gas flow enlarges after failure phase. The relationship between gas flow and axial strain can be expressed as a quadratic function and the gas flow decreases with the increasing confining pressure.
蒋承林，郭立稳. 延期突出的机制与模拟试验[J]. 煤炭学报，1999，24(4)：373-378.( JIANG Chenglin，GUO Liwen. The mechanism of delay outburst and its simulated tests[J]. Journal of China Coal Society，1999，24(4)：373-378.(in Chinese))
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2010, Vol. 29 
