Numerical Simulation for Pace of Roof-broken Deep-hole Blasting for Releasing Rock-burst Danger

This paper applied FLAC3D to researching distribution rule of abutment pressure in full-mechanized caving mining face when roof-broken pace were respectively 12m,16m,20m,24m and 28m.Combining prevention practice of rock-burst in Xinwen Mining Area,this paper obtained rational roof-broken pace was 20m.Field application showed that when roof-broken pace was 20m,abutment pressure at 9m,7.6m and 5.8m reduced respectively 30.6%,45.5% and 15.2%.Safety mining in full-mechanized caving mining face proved this pace was rational.