To obtain the relationship between the development of overburden rock fractures and changes in gas emission in the stope,based on the gas geological survey of No.220112 working face of a mine in Huainan mining area,comprehensive numerical simulation,theoretical analysis,and engineering practice methods were used to study the stress distribution in the stope,the development of overbur-den rock fractures,and the regularity of gas outburst cycles.The results showed that the development area of the overburden rock frac-ture zone in the working face was located within 17.2～40 m above the roof.The large diameter directional drilling and extraction effect of the roof arranged in this range was good,which verified the accuracy of theoretical calculations and simulation results.The gas emis-sion also showed periodic changes.After 2～3 times of roof periodic weighting,there was a large gas emission phenomenon in the work-ing face,which was about 1.5 times of the gas emission in the normal period.According to the periodic law of gas emission in the work-ing face,after the roof strike extraction drilling was supplemented,the gas emission in the working face was generally stable during min-ing.
关键词
覆岩裂隙/数值模拟/周期来压/瓦斯涌出/瓦斯治理
Key words
overburden rock fracture/numerical simulation/periodic weighting/gas emission/gas control
维普
万方数据