| With the gradual exploitation of coal resources in China, most of coal miningsdecide to take deep exploitation. However, the deeper of mining, the much content ofcoal seam gas and gas pressure, the face incidence of danger and accidents whenworking also be increased. So drainage of seam gas has become the most fundamentaland effective measure to avoid coal mine gas accident. Because of high gas ouburst inFengFeng coal mining and other larger areas, there are unique mining layer, so in orderto control outburst of gas,the method that pre-pumping should be implemented.Based on the law of gas migration in porous media, the main research object isborehole gas drainage and anti-sudden in this paper. Firstly, The law of rupturemechanism of the coal seam gas extraction from coal and rock drilling is analysed, andthe model of coal seam gas drilling drainage flow is also esteblished, which make atheoretical foundation for the reasonable design of drainage gas. Secondly, numericalsimulating different drainage under negative pressure, pore size, drainage time, coalpermeability and different gas pressure distribution and flow field distribution surroundgas drainage borehole pressure using FLUENT6.3software. According to the situationof working face in2#172103of Dashucun coal mine, many designs and technologiesare formulated such as rational comprehensive prevention outburst measures, whichoptimize the design of gas drainage. It makes great effects on conducting gas drainageeffectively, improving gas pumping rate, gas concentration and rapid reduction ofpressure, ensuring the implementation efficient of regional outburst preventionmeasures. Finally, the gas drainage measure is applied to172103work face site inDashucun coal mining and the gas drainage parameters are decided. Based on applingoptimized gas drainge has achieved good resulted, it is important to guarantee the safetyproduction of Dashucun coal mining. |
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