煤单轴加载破裂时的差分红外方差特征

doi:10.13722/j.cnki.jrme.2017.0365

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Abstract

To explore temperature anomalies of infrared radiation in the process of loading and failure and quantify the infrared radiation characteristics of coal and rock，the variance of differential infrared image temperature(VDIIT) has been proposed as a new indicator to study the transient variation characteristics of infrared radiation temperature field. The research results indicate that sudden changes in the VDIIT of coal samples could be found at the point of failure during coal failures under uniaxial loading.The abrupt changes coincided with the sudden drops on the load-time curves of the samples and the anomalies in their infrared image sequences， indicating synchronism between them. For the rectangular coal samples， the amplitudes of VDIIT at the point of failure were about 88.3～1 905.7 times(about 700 times) the average amplitudes of VDIIT during the loading process. For cubic coal samples，the amplitudes of this indicator at the point of failure were about 16.2–448.5 times(about 130 times) its average amplitude during the loading process. The figures demonstrate that the abrupt changes at the point of failure were hugely significant. The coal samples that showed a significant abrupt change in VDIIT account for approximately 95% of the total coal samples，indicating that the abrupt change was universal among the samples. The above achievements will be useful in monitoring and forecasting the natural and engineering hazards related to rock/coal structural bursts at the point of failure，and provide basic theory to water conservation and strata control in mine.

Key words： rock mechanics infrared radiation variance of differential infrared image temperature uniaxial loading water-preserved mining

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	Articles by authors
	MA Liqiang1
	2
	3
	4
	ZHANG Dongsheng2
	3
	GUO Xiaowei2
	3
	SUN Hai2
	3
	Adeleke Najeem4
	ZHANG Yao2
	3

Cite this article:

MA Liqiang1,2,3, et al. Characteristics on the variance of differential infrared image sequence during coal failures under uniaxial loading[J]. , 2017, 36(S2): 3927-3934.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0365 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS2/3927

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