考虑应变速率效应的煤岩能量演化和红外辐射特征分析研究

doi:10.13722/j.cnki.jrme.2021.0952

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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.

Key words： rock mechanics loading rate coal rock energy evolution infrared radiation

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	Articles by authors
	TANG Yiju1
	2
	HAO Tianxuan1
	3
	LI Fan1
	ZHAO Lizhen1
	LIU Jing2

Cite this article:

TANG Yiju1,2,HAO Tianxuan1, et al. Energy evolution and infrared radiation characterization of coal rocks considering strain rate effect[J]. , 2022, 41(6): 1126-1135.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0952 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I6/1126

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