Research On The Influence Of Upright Rock Pillar To Rockburst In Wudong Coal Mine

Wudong coal mine steep panel occurred 6 times serious rock burst accidents in the process of production,resulting in floor heave,deformation seriously,damaged equipment and seismic casualty,resulting in serious affected to coal mine safety production.Along with Wudong coal mine mining engineering extends to deep ground of mine,rockburst threat to further enhance.In order to analyze whether Wudong coal mine upright rock pillar rock burst of occurrence or impact,developing research on the influence of upright rock pillar to rockburst in Wudong coal mine,providing technical support and safety guarantee to good safety and efficiency mining in Wudong coal mine steeply inclined and extremely thick coal seam fully mechanized caving.According to the mining conditions in Wudong coal mine steeply inclined and extremely thick coal seam,applying rock pillar cantilever structure mechanical model theoretical analysis,determined the B3 roadway product tensile failure,B3+6 coal seam product stress type rock burst of the roof and floor.Using FLAC3D numerial method to draw conclusions as follows:start with the level of+522m after panel B1+2 mining,the maximum principal stress near the B3+6 coal seam side is higher 1.75 times than B1+2 side.The hazard of rock burst occurrence is higher than B1+2 coal seam under the excavation disturbed.The similarity material simulation experiment to draw conclusions as follows:different level panel B3+6 and panel B1+2 after mining,from the overall appearance and displacement nephogram and stress angle to analyze and conclude that the influence of upright rock pillar to rock burst is very small in Wudong coal mine.The results determined that the relation between the occurrence of rock burst in Wudong coal mine steep inclined and extremely thick coal seam and upright rock pillar is very small, do not have controlling effect.The paper established rock pillar cantilever structure mechanical model and determined maximum principal stress variety law before or after panel mining,overlying strata motion and dynamic failure characteristics,rock pillar stress and displacement variety law,providing theoretical basis for Wudong coal mine rock burst prevention.