Coal burst mechanism and prevention of large coal pillar gob-side heading face in deep mine

The stability of coal and rock in gob-side heading face is the premise to ensure the safe and efficient mining of deep coal mine. In order to explore the mechanism and prevention methods of side coal burst in heading face under the condition of large coal pillar along goaf in deep mine, theoretical analysis, numerical simulation and engineering practice were used to explore the spatial structure characteristics of overlying strata and the prediction mechanical model of coal body coal burst in heading face along goaf with large coal pillar in deep mine, and the technical method of preventing and controlling coal burst was put forward in heading face along goaf with large coal pillar in deep mine was put forward based upon 05 heading face under the condition of large coal pillar along goaf in deep mining area of Wuyang Coal Mine. The research shows that the spatial structure of overlying strata in the stope is an important load source for the formation of the abutment stress of the working face. According to different stope scales and rock movement states, different types were divided, and the estimation model of the abutment stress of the side coal body of the gob-side working face in the deep mine was established considering the load transfer of the spatial structure of the overlying strata. The abutment stress and its bearing strength of the coal body on the side of the working face are two key factors affecting the coal burst. By analyzing the distribution characteristics and size relationship between them, the possibility and relative position of coal burst can be quantitatively predicted. Hydraulic cavitation can promote the effect of bearing width increase and stress peak decrease in the coal body of the working face. Implementing hydraulic cavitation and pressure relief technology was significantly mitigated the coal burst instances in the coal body on the side of the working face. The coal burst prediction model and the hydraulic cavitation pressure relief method have been applied to the mining engineering of multiple working faces in the deep mining area of Wuyang Coal Mine, providing some reference for the prevention and control of mine disasters under similar conditions. © 2024 China University of Mining and Technology. All rights reserved.