【摘要】 为探寻煤在承载受力破裂过程中红外辐射温度场的异常,对煤破裂时的红外辐射特征进行量化表述。提出一种新的红外辐射定量分析指标,即差分红外热像序列图的温度方差(差分红外方差),对煤样单轴加载破裂过程中红外辐射温度场的瞬时变化特征进行探究。研究结果表明,煤样破裂时的差分红外方差会发生突变。突变时刻与载荷曲线突降以及红外热像序列图出现异常的时刻一致,具有同步性。长方体煤样破裂时,差分红外方差突变程度约达到其加载过程中平均振幅的88.3~1 905.7倍(约700倍),立方体煤样破裂时为16.2~448.5倍(约130倍),具有显著性。发生突变煤样的比例约为95%,具有普遍性。研究结果可应用于由煤岩受力破裂引起的岩爆、煤爆等自然灾害和人类工程灾害等的预报预警,可为煤矿保水开采和岩层控制提供借鉴。更多还原

【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.更多还原