科研之友
微信
新浪微博
Facebook
分享链接
摘要
For the purpose of protecting the environment and maximizing resource conservation, it adopts pillarless mining rechnology to mine coal in Jixian Coal Mine. It is hard to implement the general gob-side entry retaining technology due to the larger mining depth and many working faces with hard roof. In order to solve the problem that large and long time hanging roof, large surrounding rock stredd concentration on the condition of using gob-side entry retaining in hard roof, pre-splitting blasting technology in weakening of hard roof was adopted in seconf working face intake airway of West Second Mining Area of Jixian Coal Mine, which weakened the roof and reduced the length of henging roof and decrease the impact of motion of hard roof on the artifical side. The results showed that after surrounding-rock movement of gob-side entry rended to be stable, tunnel roof convergence was much less than thhat of the general gob-side entry retaining. And the load of artifical side was less than the bearing capacity of artifical side. Therefore the gob-side entry was stable.
