Green Technique in Coal Mining
QIAN Ming-gao, XU Jia-lin, MIAO Xie-xing (1. College of Mineral and Energy Resources, CUMT, Xuzhou, Jiangsu 221008,China; 2. School of Sciences, CUMT, Xuzhou, Jiangsu 221008, China)
The concept of green technique in coal mining was proposed. Its connotation and technical system were explained. The theory foundation of the green technique in coal mining is the distribution behaviour of joints, fractures and bed separations, the seepage flow behaviour of methane and water in the broken rock strata caused by the key strata break after mining. The main content of the green technique in coal mining includes water-preserved-mining, coal mining under building and bed separation grouting to reduce surface subsidence, partial extraction and backfill mining, simultaneous extraction of coal and coal-bed methane. coal roadway supporting, underground discharge of partial rock refuse and underground coal gasification, etc.