Abstract:Rockbursts frequently occur during mining in magmatic intrusion areas. The mechanism of rock burst at heading roadway in thick coal seam in magmatic intrusion areas is thus studied theoretically and numerically. A formula for calculating the stress distribution in surrounding rock of the roadway was deduced based on the elastoplastic theory. The contours of stress distribution shows that the direction of maximum principal stress and the concentration area position of maximum shear stress were perpendicular to the inclination angle of coal seam. The dip angle of coal seam does not change the concentration degree of maximum principal stress and shear stress. The lateral pressure coefficient had a greater influence on the concentration of the maximum principal stress. The large hard magmatic rock roof suspending in the goaf leads to the overall increase of the stress in the large area of coal nearby,which provides the static loading for rockburst. Tunneling induces the instantaneous release of energy from the local magmatic rock,which provides the dynamic loading for rock burst. Based on the above analysis,the mechanical model of rock burst in roadway in thick coal seam in magmatic rock intrusion zone was established,the criterion of rockburst occurrence was obtained and then the mechanism of rockburst was obtained. The application of the research results guided the prevention of rock burst in practice.
杨伟利. 煤矿孤岛工作面冲击危险性识别与防冲研究[博士学位论文][D]. 北京:北京科技大学,2016.(YANG Liwei. Research on coal seam occurance and its dynamic disasters prevention and control technologies under an extremely thick magmatic rock[Ph. D. Thesis][D]. Beijing:China University of Mining Technology,2016.(in Chinese))
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