摘要
Abstract
In response to the presence of an old roadway outside the stop mining line and inside the working face of the 2215 working face in Yingpanhao Coal Mine,Inner Mongolia,influenced by the old roadway cutting action,isolated coal bodies are formed outside the stop mining line during the final stage of stoping in the working face,which increases the risk of rockburst during the final stage of mining in the working face.The impact risk of isolated coal bodies during the final stage of stoping in the working face is studied and analyzed using methods of limit equilibrium theory,FLAC3D numerical simulation,and on-site microseismic data actual measurement.Measures of large-diameter borehole pressure relief for isolated coal bodies are proposed.The research results indicate that,through the calculation of limit equilibrium theory,it is obtained that reserving about 30 m of coal pillars during the final mining period in the 2215 working face can ensure the stability of isolated coal bodies;The numerical simulation results indicate that a coal pillar with a width of 30 m is the critical width for coal pillar instability;According to the on-site microseismic actual measurement results,after adopting measures of large-diameter borehole erosion-control and pressure relief,the isolated coal bodies left during the final mining period in the working face will not cause large-scale instability and trigger impact dynamic disasters.Based on comprehensive analysis,a width of 30 m for isolated coal bodies is reasonable.关键词
孤立煤体/FLAC3D数值模拟/现场实测分析Key words
isolated coal body/FLAC3D numerical simulation/on-site actual measurement analysis分类
矿山工程
