Abstract:

Based on the 3205 return air roadway of thick seam and large section in Wangpo coal mine of high gas, it analyzes how the high gas and surrounding rock stability of large section coal roadway affect the safe and efficient drifting, and proposes the gas prevention and control measures of synergistic effect between ahead drilling toward the roadway and gas release hole, as well as supporting technology of high pre-stressed and high strength bolt and anchor. Site practical show that the technology effectively put an end to the gas concentration transfinite phenomenon of tunneling face and return current, and guarantee the stability of the surrounding rock, which realize the rapid and safety excavation of high gas coal roadway with large section.

Key words: High Gas Mine, Coal Roadway with Large Section, Rapid Excavation, Gas Drainage while Drivage