Study On The Gas Control Simulation Experiment Of The Lower Protective Seam In Gubei Coal Mine

This paper taking huainan mining group of north mining protective layer6-2coal mining as an engineering example, the mining on the protective layer after layer8coal gas extraction technologies and gas extraction technology to cover their own research and analysis of the system.Its research results to promote the promotion and application of protective layer mining technology, and coal and gas outburst mine safe and efficient production and the sustainable development of coal mine has very important significance.In the working face under the influence of mining coal face roof and floor rock deformation, there will be a corresponding mobile face will redistribute the stress state of surrounding rock, resulting in obvious changes in the permeability of coal and rock.Protective layer mining is also use this principle of outburst danger of protected coal seam gas comprehensive managemen.Through theoretical analysis, numerical simulation method, similar simulation experiment and field research means such as the engineering practice, the protection layer after mining the upper coal and rock under unloading characteristics, coal strata movement deformation and fracture of rock mass and coal seam gas extraction methods for pressure relief system research.By protective layer6coal seam mining working face tail gas drainage and coal face return air lane and tail wind exhaust gas comprehensive gas control in practice, be protective layer8coal floor roadway wear layer upward pressure, the gas drainage drilling6coal floor roadway up wearing layer drilling pressure relief gas drainage, and6coal seam roadway drainage and gas drainage parameters based on the analysis of research, showed that protective layer6coal mining and the application of pressure relief gas drainage technology successfully eliminated the protective layer, eight coal outburst danger, decreased by protective layer8gas content of coal, the8coal seam with coal and gas outburst danger, successful transition to low gas no highlight the danger of coal seam, implemented the protective layer, eight the safe and efficient mining of coal.The largest coal layer8expansion deformation of50.85mm, its expansion deformation rate was21.456‰, eliminate be protective layer are more than highlight the dangers the critical value of6.0‰,6-2coal as a protective layer of sudden elimination effect is feasible.After the protective layer mining under the direction of pressure relief protection Angle of about79.8°, can according to this study provide a reference to the pressure relief protection Angle, the recommended procedures and regulations of the current pressure relief protection Angle increase or adjust.