Study On Gas Occurrence Regularity And Comprehensive Control Tcehnology In221Fully Mechanized Top Coal Caving Face Of Xiashijie Mine

This paper is a study of Jiaoping mining area in Xiashijie coal mine fully mechanizedcaving face gas drainage method. Based on the basic geological conditions of coal mine rockfestival, the original221block4-2gas pressure, gas drainage radius and the basic parametersare determined, the coal seam gas content were calculated, the4-2coal seam belongs to thepre pumping coal, provides the data support for the parameter design of pre pumping drillingat the same time using drilling site; return water measurement method in213fullymechanized working face goaf caving zone height determination site, provides design basisfor mining layout layer Xiang high pumping governance goaf gas in.According to the experimental data, combined with the theory of gas resources in221working face of reserves is calculated and evaluated. Starting from the existing condition ofcoal mine, the reference stope layout, production continues, the "along the borehole in thecoal seam extraction and high pumping Lane+upper corner tube to drainage" of gob gas incomprehensive caving face of gas, and the drainage hole drilling parameter, layout layer, tubearrangement is designed.Combined with gas pre drainage and data mining process emission conditions, theevaluation of the program. After investigation, the design of gas drainage schemes can satisfythe fully mechanized top coal caving working face gas control needs, solve the fullymechanized coal mining face frequent overload problem, achieved the expected goal.