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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摘要为了研究煤岩材料破坏的加载速率效应，利用岩石力学加载试验系统及红外辐射监测平台，开展不同等级速率的单轴压缩试验，并从破坏形态、力学性质、能量演化和红外辐射特征等角度进行分析。研究结果表明：随着应变速率增加，试样破坏形态由中、低速率下的剪切破坏向高应速下的全面剪胀失稳破坏转变；试样应变速率的对数与峰值强度呈正相关，可以采用二项式描述；应变速率与能量演化密切相关，存在塑性向脆性转变的临界速率；高应变速率试样时热像图上出现高温异常突变点，低应变速率试样时才出现高温异常区域；低应变速率试样最高温值出现在应力峰值前几秒，中、高应变速率试样最高温值与应力峰值几乎同时到达，临破裂前出现了“V”型异常转折现象。研究结果可以为岩石动力灾变预警提供参考。

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	唐一举1
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	赵立桢1
	刘静2

关键词 ：岩石力学, 加载速率, 煤岩, 能量演化, 红外辐射

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

引用本文:

唐一举1，2，郝天轩1，3，李帆1，赵立桢1，刘静2. 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[J]. 岩石力学与工程学报, 2022, 41(6): 1126-1135.
TANG Yiju1，2，HAO Tianxuan1，3，LI Fan1，ZHAO Lizhen1，LIU Jing2. Energy evolution and infrared radiation characterization of coal rocks considering strain rate effect. , 2022, 41(6): 1126-1135.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0952 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I6/1126

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