Abstract:

The basic roof of Yuwu mine S2206 high gas full-mechanized caving coal face is dense hard and large thickness, and it is not easy to collapse in intial stage of mining.If large area roof caving suddenly,could lead to the working face mine pressure appear acutely, gas rise suddenly.In order to solve this problem,the concrete measures of weakening the working face roof are introduced. Practice shows that by the method pre-mining deep hole pre-splitting blasting ,weakening roof in advance,we have solved the hazard of large area roof pressure, recovered the top-coal in advance, realized the working face safe and efficient mining.

Key words: Hard roof, Full-mechanized caving coal face, Deep hole pre-splitting blasting