Through site observation and indoor measurements in XieJiaji No.2 Coal Mine in Huainen and Luling Coal Mine in Huaibei, it is discovered that the fragmentation
Along with underground mining, movement and deformation of overburden gradually extends in all directions and up to the ground surface and finally forms a surfa
Application of bolting and shotcreting used in Chinese coal mine underground engineering has been more than 40 years. By the end of 1993. total roadway length a