Stability of coal pillars in main roadway of Sihe Coal Mine's western third panel area
Taking the west third panel of Sihe Mine as the research background,numerical simulation software was used to study the distribution characteristics of advanced support stress and the evolution law of plastic zone in the protective coal pillar of the main roadway under different factors such as mining advancing speed,mining height,and working face length.The results show that as the mining speed of the working face increases,the peak pressure and stress concentration coeffi-cient of the advanced support in the coal body in front of the working face gradually increase,and the distance between the pressure peak and the coal wall continuously decreases,but the range of the plastic zone of the coal body in front of the working face decreases.As the mining height of the working face increases,the stress peak and plastic zone range of the coal body in front of the working face gradually increase.The increase in the length of the working face will lead to a slight in-crease in the peak stress of the coal body in front of the working face,but the increase is smaller,while the plastic zone range of the coal body in front of the working face remains unchanged.
main roadway coal pillarsstabilityinfluential factor
万方数据
维普
