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)
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.
宋义敏1,杨小彬2. 煤破坏过程中的温度演化特征实验研究[J]. 岩石力学与工程学报, 2013, 32(7): 1344-1349.
SONG Yimin1,YANG Xiaobin2. EXPERIMENT STUDY OF TEMPERATURE EVOLUTION CHARACTERISTICS DURING DEFORMATION AND DESTRUCTION PROCESS OF COAL. , 2013, 32(7): 1344-1349.
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