Damage evolution analysis of coal during intermittent failure process based on radial deformation increment
LU Zhiguo1，2，3，JU Wenjun1，2，3，GAO Fuqiang1，2，3，SUN Zhuoyue1，2，3，PENG Xiangyuan1，2，3
(1. Coal Mining Research Institute，China Coal Technology and Engineering Group Co.，Ltd. of CCTEG，Beijing 100013，China；2. State Key Laboratory of Coal Mining and Clean Utilization，China Coal Research Institute，Beijing 100013，China；
3. Coal Mining Research Institute，China Coal Research Institute，Beijing 100013，China)
Abstract：Intermittent failure behavior often occurs in coal samples under uniaxial compression. The damage assessment of complex failure process is helpful to clarify the energy evolution accompanying the process，which is of great significance to the early warning and prevention of mining engineering disasters. To explore the damage evolution in the process of intermittent failure，the standard coal sample was subjected to conventional uniaxial loading，and its deformation characteristics were monitored in real time. It is found that when severe damage occurs to the local crack cluster of coal sample under external load，the axial load drops suddenly，and the radial deformation increases sharply. The closer the load is to the peak strength，the faster the growth rate is. The damage originates from the development and expansion of internal cracks，resulting in the rapid expansion of the sample along the radial direction. Thus a method of damage characterization based on radial deformation increment was proposed，which is more applicable to the nonlinear damage evaluation of heterogeneous media such as coal. Comparing the damage evaluation based on radial deformation increment with acoustic emission and the development and expansion evolution of fracture，the highly consistent evolution process of the above three proves the reliability of damage evaluation based on radial deformation. The results show that，the cracks are locally clustered or interconnected along the direction of the maximum principal stress to form large-scale fracture in the intermittent failure stage. The radial expansion of the sample causes local severe damage，which leads to a sharp increase in its damage variables. Intermittent failure behavior originates from repeated local severe damage in different areas of the sample. The zigzag stress-strain curve and the nonlinear damage evolution accompanying this process indicate that the damage mutation phenomenon exists in heterogeneous media such as coal under external load.
卢志国1，2，3，鞠文君1，2，3，高富强1，2，3，孙卓越1，2，3，彭相愿1，2，3. 基于径向变形增量的煤间歇性破坏过程损伤演化分析[J]. 岩石力学与工程学报, 2023, 42(S1): 3529-3540.
LU Zhiguo1，2，3，JU Wenjun1，2，3，GAO Fuqiang1，2，3，SUN Zhuoyue1，2，3，PENG Xiangyuan1，2，3. Damage evolution analysis of coal during intermittent failure process based on radial deformation increment. , 2023, 42(S1): 3529-3540.
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2023, Vol. 42 
