Research on the Mining Practice of Protection Layer in the Complex Geological Conditions of Qidong Coal Mine

To study the effect of 82 coal seam unloading and outburst prevention with 71 coal seam mining,as well as the influence of the integrated application of research methods of theoretical analysis and field practice, the feasibility of the protective layer under the condition of mining research, and in the process of 71 coal seam mining, below 82 coal seam gas content, gas pressure and the effect of the deformation of coal unloading field measurement and comprehensive theoretical analysis. The research results show that the protective layer of 71 coal seam as the lower 82 coal mining is feasible in theory, in 7137 working face of the actual mining process, the lower 82 significant increase in the permeability of coal seam, the gas content is greatly reduced, unloading deformation effect is obvious, further verify the three 71 coal seam as the lower protective layer of 82 coal mining, the discharge pressure and outburst prevention with dual effectiveness, to ensure safe and efficient mining of coal seam 82.