The coalbed methane need to be exploited before coal mining through gas drainage, in order to obtain the dual purposes of lower coal mine accident rate and transfer gas into treasure. There is a strong fluid-solid coupling effect during the gas drainage processing. The seepage law of coal from Guzhuang mine of China at different gas pressure is tested, and its klingberg coefficients is obtained by curve fitting method. Based on the klingberg effect, the liquid-solid coupling effect of coal and gas is simulated through secondary development of ABAQUS software in this paper, in order to obtain the dynamic variation rule of gas pressure field and seepage field around the gas drainage hole. It provides a new quantitative method of determining gas drainage parameters and location. Numerical simulation results show that, during the processing of gas drainage, the stress field and seepage field are mutual influence and restriction, the gas pressure around the drainage holes is reduced and the coal seam stress relief, permeability increases, these play a prominent role in the effective prevention of coal and gas outburst. Research results contribute to obtain accurate dynamic distribution law of the stress and seepage fields around gas drainage holes. It provides theoretical basis for optimizing gas drainage technology and raising gas drainage effect.
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