financially supported by the National Key Research and Development Program (No. 2016YFC0801402);the National Natural Science Foundation of China (No. 51374236);Chongqing Research Program of Basic Research and Frontier Technology of China (No. cstc2015jcyj BX0076)
Gas extraction practice has been proven for the clear majority of coal mines in China to be unfavorable using drill holes in the coal seam. Rather, mining-induced fractures in the goaf should be utilized for gas extra...