Coal in the natural geological body is typical heterogeneous and potentially contains widely distributed faults.These faults affect the migration of gas and are closely related to the occurrence of coal and gas outburst.In order to analyze the fault strike and gas migration characteristics in front of the coal mining face,the permeability of complete and heteroge-neous coal during mining is described by numerical simulation in this study.It is revealed that the higher gas pressure gradi-ent in front of the working face is mainly due to the blocking effect of the low permeability zone along the fault,which leads to the formation of the high pressure gas zone.The field test confirms that the gas content in this area is 2～3 times that of ordinary coal.The model can be used to guide the theoretical evaluation of gas dynamic disaster prevention and control measures in coal mines.
关键词
煤与瓦斯突出/煤的渗透性/气体运移
Key words
coal and gas outburst/coal permeability/gas migration
维普
万方数据