基于单轴压缩红外辐射的煤岩损伤演化特征

Coal-rock damage evolution characteristics based on infrared radiation under uniaxial compression

为定量分析煤岩受载过程中红外辐射温度特征参数与煤岩损伤演化规律,采集并分析了煤岩单轴压缩条件下的红外辐射温度数据,根据损伤力学理论构建了煤岩损伤模型,得到了最高红外辐射温度积累量和煤岩损伤之间的关系。结果表明:(1)煤岩受载最高红外辐射温度-时间曲线与载荷-时间曲线有很好的对应关系,最高红外辐射温度能够反映煤岩受载破坏情况;(2)基于最高红外辐射温度积累量的煤岩损伤演化模型能够很好地反映煤岩在单轴压缩条件下裂隙缺陷产生、发展和破坏的演化过程;(3)基于最高红外辐射温度积累量的计算应力和实测应力的整体相关性系数达到0.8以上,呈高度相关,且计算应力-应变曲线峰值超前于实测应力-应变曲线峰值。

In order to quantitatively study evolution law between temperater parameter of infrared radiation and coal-rock damage law under uniaxial compression,temperature data of infrared radiation during coal-rock failure process was collected and analyzed.A coal-rock damage model was established according to damage mechanics theory,so as to obtain relationship between the maximum infrared radiation temperature(MIRT)and coal-rock damage.The results show that:①The MIRT-time curve has a good correspondence with load-time curve of the coal-rock under loading,and the MIRT can reflect the damage of coal-rock under loading.②The coal-rock damage model based on infrared radiation temperature accumulation can well reflect evolution,development and failure of cracks in the coal-rock under uniaxial compression.③The correlation coefficient between calculated stress based on MIRT accumulation and measured stress is more than 0.8,which is highly correlated,and peak of the calculated stress-strain curve is ahead of the one of the measured stress-strain curve.