Proposal For Rational Disposal Of The Abandoned-Stope And Relief Of The Mining Pressure

After entering the mine deep mining, the upper part of the mining often forms a large area of abandoned-stope, if not processing the abandoned-stope timely, it will because of abandoned-stope falling or collapsing to form a roof rock burst accident, and the high pressure focusing on the deep mine will also lead to rock burst or deformation accident. This paper is based on the research and summary of processing abandoned-stope methods,researching the mining of the upper mining space and the deep mining orebody,taking the small Changba lead zinc mine as an example, with the help of the numerical simulation, and the following conclusions are obtained:（1） Based on methods of abandoned-stope disposal,combined methods and new methods which are invented in recent years,with the thought of the “V”-shaped top-grooving in hanging wall to form an arch-like destressed zone and the partition mining to reduce stress levels,a steeply inclined orebody mining abandoned-stope treatment and relief mining method is invented.（2） Respectively, the application of ANSYS and FLAC^3D simulation analyses are used and the reasonable roadway position of the “V”-shaped top-grooving and the drilling depth of the partition mining are put forward.（3） Application of the steeply inclined orebody mining abandoned-stope treatment and relief mining method can economically and effectively deal with the abandoned-stope of small Changba lead-zinc mine, and the rock burst in deep mining,and make the horizontal stress and vertical stress reduce to 10 MPa.（4） It can only use the partition mining at the bottom wall of roadway in hanging wall.（5） ANSYS and FLAC^3D can get the similar conclusion, but the large deformation of the FLAC^3D license led to partially release and redistribution of the high pressure.