Study on development of fractures in mining overburden rock and regularity of periodic gas emission
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.
overburden rock fracturenumerical simulationperiodic weightinggas emissiongas control
万方数据
维普
