Analysis of Stress Distribution Characteristics During Mining of Irregular Island Working Face
In order to prevent and control the impact ground pressure caused by stress concentration during the mining of irregular island working face,taking the E8104 working face of Erjingtian Coal Mine as the research background,GDEM numerical simulation software is used to investigate the stress distribu-tion during the mining of the E8104 working face,and to analyze the stress distribution law and character-istics of the working face affected by the mining back.The research results show that the coal columns on both sides of the irregular island face are more concentrated in stress after drilling the cutting roadway,and the rock burst is easily induced by the influence of dynamic loading;when mining back to the first square stage,the stress concentration of the coal columns on both sides increases significantly,with the stress val-ue of 44.5 MPa and the stress concentration coefficient of 4.45.When mining to the second square stage,the right side of E8104 has relatively low stress level due to the increase of width,but there is obvious stress concentration phenomenon between it and E8102 mining area,and the stress value at the inflection point of right-angled coal pillar is higher than that at the neighboring position,and the stress concentration coefficient is as high as 5.1,so more attention should be paid to take anti-shock measures when mining the coal.
underground miningirregular island working facenumerical simulationrock burst
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