Experimental study on prevention and control of coal-bed methane (CBM) through mining of the protective seam of multiple coal seams

摘要

This research intends to obtain the pressure relief angle of protective scope through research and study of the protective scope and effects after mining of coal seam No. 2 as the protective seam of coal seam No. 5 in mining area No. 23 of Jinzhushan Mining Co., Ltd. CBM flow attenuation coefficients of taps within protective area are reduced from 0.016 and 0.015 d-1 before mining to 0.008 and 0.011 d-1; and average CBM extraction amount in seven days is raised by two to three times. This research provides scientific basis for mining of protective seams for the mine.