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| Energy evolution and infrared radiation characterization of coal rocks considering strain rate effect |
| TANG Yiju1，2，HAO Tianxuan1，3，LI Fan1，ZHAO Lizhen1，LIU Jing2 |
(1. College of Safety Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454000，China；2. Department of Resources and Environment，Henan College of Industry and Information Technology，Jiaozuo，Henan 454000，China；
3. State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization，Henan Polytechnic
University，Jiaozuo，Henan 454000，China) |
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Abstract To study the loading rate effect of coal rock material damage，uniaxial compression tests with different grade rates were carried out by using the rock mechanics loading test system and infrared radiation monitoring platform，and damage morphology，mechanical properties，energy evolution and infrared radiation characteristics were analyzed. The results show that，with increasing the strain rate，the damage morphology of the specimen changes from shear damage at medium and low rates to full-scale shear expansion destabilization damage at high rates. The logarithm of the strain rate of the specimen is positively correlated with the peak strength，which can be described by binomial. The strain rate is closely related to the energy evolution，and there is a critical strain rate at which transformation from plastic to brittle occurs. High-temperature abnormal mutation points appear on the thermal image at for high strain rate specimens，while high-temperature abnormal regions appear only at for low strain rate specimens. The highest temperature value of the low strain rate specimens appears a few seconds before the stress peak，while for the medium and high strain rate specimens，the highest temperature value arrives almost simultaneously with the stress peak and a“V”shape anomalous turn occurs before rupture. The results of the study can provide a reference for rock dynamic hazard warnings.
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2022, Vol. 41 
