In order to scientifically prevent and control gas disasters and spontaneous combustion risks in the goaf of the outburst coal seam roof cutting and roadway retaining working face,it is necessary to accurately grasp the characteristics of air leakage in the goaf and take targeted fire prevention and extinguishing measures.This article takes the 1452(1)protective layer roof cutting and roadway retaining working face of Dingji Coal Mine in Huainan City as the engineering background.Through the measurement and analysis of the pressure energy of the working face,the position of the working face air leakage is obtained.Combined with the measured roadway,air volume,pressure energy distribution and other information,a schematic diagram of the distribution of the working face air leakage field is drawn.Using SF6 tracing principle to measure the air leakage volume(air leakage rate)and air leakage velocity in the goaf of the roof cutting and roadway retaining working face.The research results show that the air leakage volume of the 1452(1)protective layer roof cutting and roadway retaining working face varies at different stages of stoping.Due to the continuous compaction of the goaf,the air leakage volume decreased from 312.1 m3/min during the initial mining period to 236.7 m3/min during the mid mining period.The air leakage rate then decreased from 13.35％during the initial mining to 10.26％during the mid mining period,while the air leakage velocity increased from an average of 0.554 m/s during the initial mining period to 0.75 m/s due to the empty roof behind the frame.The research conclusion aims to provide data support for the formulation of fire prevention and extinguishing measures in the goaf of high gas outburst coal seam protective layer roof cutting roadway working face.
关键词
高瓦斯突出煤层/切顶留巷/采空区/漏风特征参数
Key words
high gas outburst coal seam/roof cutting and roadway retaining/goaf/air leakage characteristic parameter
维普
万方数据