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dynamic tensile behaviour and crack propagation of coal under coupled static-dynamic loading

International Journal of Mining Science and Technology 2020年第5期30卷 659-668页

作者： Xianjie Hao Weisheng Du Yixin Zhao Zhuowen Sun Qian Zhang Shaohua Wang Haiqing Qiao Beijing Key Laboratory for Precise Mining of Inter-grown Energy and Resources China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Water Resource Protection and Utilization in Coal Mining Beijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084China

The fracture behaviour and crack propagation features of coal under coupled static-dynamic loading conditions are important when evaluating the dynamic failure of *** this study,coupled static-dynamic loading tests are conducted on Brazilian disc(BD)coal specimens using a modified split Hopkinson pressure bar(SHPB).The effects of the static axial pre-stress and loading rate on the dynamic tensile strength and crack propagation characteristics of BD coal specimens are *** average dynamic indirect tensile strength of coal specimens increases first and then decreases with the static axial pre-stress *** no static axial pre-stress is applied,or the static axial pre-stress is 30%of the static tensile strength,the dynamic indirect tensile strength of coal specimens shows an increase trend as the loading rate *** the static axial pre-stress is 60%of the static tensile strength,the dynamic indirect tensile strength shows a fluctuant trend as the loading rate *** to the crack propagation process of coal specimens recorded by high-speed camera,the impact velocity influences the mode of crack propagation,while the static axial pre-stress influences the direction of crack *** failure of coal specimens is a coupled tensile-shear failure under high impact *** there is no static axial pre-stress,tensile cracks occur in the vertical loading *** the static axial pre-stress is applied,the number of cracks perpendicular to the loading direction decreases,and more cracks occur in the parallel loading direction.

关键词： Coal Coupled static-dynamic loading SHPB dynamic fracture behaviour Crack propagation

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