摘要
Abstract
In order to determine gas extraction effect of №409 mining face in Huangling №2 Coal Mine, the mining face was divided into five evaluation units based on the different coefficient of pre-drainage time, and then the main gas drainage indexes were calculated.The results show that the residual gas content is less than 3m3/t, the residual gas pressure is less than 0.5MPa and the gas pre-drainage rate is 39.7%.In the mining process, the gas concentration of air return is less than 0.65%, and the pre-drainage effect is better.关键词
黄陵二号煤矿/煤层瓦斯/抽采效果Key words
Huangling№2 Coal Mine/coalbed gas/gas extraction effect分类
矿业与冶金
