Research on Comprehensive Gas Control Technology for Protective Layer Mining Faces
In response to the problems of high gas content and high pressure in coal seams during mining,it is proposed to first extract the No.6 coal seam,which has a thinner underlying thickness and relatively lower difficulty in gas control.Take the 6th coal seam as a protective layer to eliminate the risk of outburst in the overlying 9th coal seam,as well as the overlying 2nd and 5th coal seams.In response to the problems of high gas emission in the upper and lower adjacent layers of the 10601 working face of the 6th coal seam during the mining period,as well as in the goaf,it is proposed to comprehensively adopt methods such as high-level drilling,high drainage tunnels,buried pipes in the goaf,and strengthened coal seam extraction for treatment.After on-site application,the gas concentration in the return air corner and return air flow during the mining period of 10601 working face were controlled within 0.43%and 0.32%,respectively,and the problem of large gas emission from the mining face was effectively solved.