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| Experimental study on the correlation between coal rock stability and deformation localization evolution |
| LV Xiangfeng1，ZHU Chenli2，SONG Yimin2，XU Hailiang2，AN Dong2 |
| (1. School of Civil and Resource Engineering，University of Science and Technology Beijing，Beijing 100083，China；2. School of Civil Engineering，North China University of Technology，Beijing 100144，China) |
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Abstract The correlation between the stability of coal specimens during the whole process of deformation and damage with the evolution of deformation localization was studied by uniaxial compression test method. A kind of coal was selected as the test piece，and the deformation localization evolution of the specimens was observed by digital speckle correlation method. The tensile displacement and rate，the sliding displacement and rate and the shear stress displacement of the deformation localization band，as well as the energy evolution of the surrounding rock during deformation，were analyzed. The results show that，in the process of deformation and failure of coal and rock，the reduction of the bearing capacity of coal and rock is caused by the abrupt changes of tensile and sliding displacements in the deformation localization band of coal and rock，that the overall stability of coal and rock at the macro level is related to both the equivalent stiffness and the shear stress reduction of deformation localization band，and that，in the process of specimen instability，the deformation energy release and the stress release of the surrounding rock are not synchronized，that is，the stress release lags behind the deformation energy release of the surrounding rock.
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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2021, Vol. 40 
