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| EXPERIMENT STUDY OF TEMPERATURE EVOLUTION CHARACTERISTICS DURING DEFORMATION AND DESTRUCTION PROCESS OF COAL |
| SONG Yimin1，YANG Xiaobin2 |
| (1. School of Architecture and Civil Engineering，North China University of Technology，Beijing 100144，China；2. School of Resources and Safety Engineering，China University of Mining and Technology，Beijing 100083，China) |
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Abstract The evolution characteristics of deformation fields and temperature fields are inspected and analyzed by using the digital speckle correlation method and infrared thermal imager. The test material is a kind of coal and the specimens are loaded by uniaxial test machine. The analytical results show that：(1) The deformation field evolution of coal specimen is divided into two phases：initial uniform deformation evolution to deformation localization at pre-peak loading stage，and deformation concentration in the localization band at post-peak loading stage. (2) The temperature evolution of coal specimen is divided into two phases：temperature rises due to internal particle spacing change caused by thermo-mechanical coupling effect at pre-peak loading stage；temperature decreases due to the tensile-shear effect and the sliding effect of deformation localization band at post-peak loading stage. (3) The temperature change is obvious in the deformation and destruction process of coal specimens；and the temperature evolution characteristics are similar inside and outside the deformation concentration band. The temperature increases at pre-peak loading stage and decreases at post-peak loading stage. The temperature inside the deformation localization band is higher than that outside the deformation localization band.
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Received: 19 November 2012
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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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2013, Vol. 32 
