天池矿综放工作面瓦斯钻孔抽放技术研究与应用.pdfVIP

Subject ：Research and Application on Gas Drill Drainage Technology in Mechanized Caving Face of Tianchi Coal Mine Specialty ：Safety Technology and Engineering Name ：Li LeiZhang W （Signature ） Instructor ：Li Shugang L （Signature ） Xiao Lei Shuga （Signature ） ABSTRACT Gas disaster is one of the main factors which influent the coal mine safety production pre-pumping coal seam gas is a solution of such accident, which is the most fundamental and most effective measure. According to the fluid conservation of mass in porous media, pre-pumping drilling around the coal gas flow field is setted as the research object and the the boreholes coal gas seepage model can be established, also the numerical solution results will be abtained. Numerical simulation by FLUENT software to analyze the different extraction negative pressure, drill diameter ，extraction time, coal permeability drainage hole under the conditions of the radius and volume of gas extraction. The influence law of various factors which to drill pre-pumping coal seam gas is investigated. Combined with the actual conditions in Tianchi Mine of Yanzhou Mining Group. Analysis of mine on the 15th coal seam gas content and distribution rule, which use coal seam gas content method to predict 401 fully mechanized coal face gas emission. Gas emission law in the process of mining can be got by determine and analysis, and through daily output, air volume, the amount of gas extraction, it can abtained 15th coal and seam gas