In response to the issue of reasonable mining speed of the mine working face in the case of rock-burst,this paper studies deeply into the reasonable advancing speed of the working face,taking the first min-ing face of extremely thick coal seam in Zhundong No.2 Coal Mine as the background,and by adopting theo-retical analysis and numerical simulation software in combination with the field microseismic data.The find-ings show that:With the advance of the working face,the peak value of the advanced support pressure grad-ually increases,and the stress concentration is obvious,resulting in a gradual increase in strain energy densi-ty.With the increase of the advancing speed,the peak stress presents a significant nonlinear increasing trend.The peak strain energy density is positively correlated with the advancing speed.The higher the ad-vancing speed,the greater the shock hazard index of the working face,especially when it reaches 8.0m/d,the index increases abnormally,and the shock hazard of the working face is strong;but when the speed in-creases to 5.6m/d,the variation difference is insignificant,and the mining speed can be increased by 5.6m/d through numerical model analysis.According to the microseismic monitoring data measured during the mining stage of the 1101#working face,and the analysis of relevant microseismic energy at the uniform velocity of 2.45 m/d,3.10 m/d and 4.78 m/d,it indicates that the overlying rock is relatively stable during the mining of the working face,and the mining speed can be increased to 5.6 m/d in the case of a maximum mining speed of 4.78 m/d.The findings provide a scientific basis for improving the productivity of the coal mine with rock burst in the first mining face of extremely thick coal seam.
关键词
冲击地压/推进速度/数值模拟分析/微震数据/能量变化
Key words
Rock Burst/Advancing Speed/Numerical Simulation Analysis/Microseismic Data/Energy Change
维普
万方数据