Rock burst hazard analysis and prevention technology in the staggered area outside the terminal line of the working face
Restricted by the mining layout of the working face and the on-site conditions,the terminal line of the No.7618 working face is staggered layout of the No.7620 goaf,bring certain impact on the safe production of the working face.The distribution characteristics of microseismic events during the mining period of No.7620 working face and the driving period of No.7618 working face were meas-ured and analyzed,and numerically simulated the stress evolution characteristics of the staggered area of the terminal line of No.7618 working face.It was found that as the distance of the staggered area of the terminal line continued to increase,the peak of the leading support pressure in the front coal body gradually decreased,summarized the main control factors of rock burst hazard in the staggered ar-ea of the terminal line,including mining depth,fault structure,and the impact of goaf.The prevention and control scheme of rock burst hazard based on large diameter pressure relief drilling and roof presplitting blasting was formulated,which has provided reference for the prevention and control of impact hazard under similar conditions.
rock burststaggered area of terminal linestress evolutionprevention technology
万方数据
维普
