层状片麻岩红外辐射特征研究  

Study on infrared radiation characteristics of layered gneiss

作　　者：闫顺玺 皇甫润 王晓雷 蒋鹏程 詹思博 YAN Shunxi;HUANGFU Run;WANG Xiaolei;JIANG Pengcheng;ZHAN Sibo(College of Mining Engineering,North China University of Science and Technology,Tangshan 063210,Hebei,China;Hebei Province Key Laboratory of Mining Development and Safety Technique,Tangshan 063210,Hebei,China)

机构地区：[1]华北理工大学矿业工程学院,河北唐山063210 [2]河北省矿业开发与安全技术重点实验室,河北唐山063210

出　　处：《河南理工大学学报（自然科学版）》2022年第2期156-163,共8页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(51134005)。

摘　　要：为探究不同层理倾角片麻岩的破裂失稳与红外辐射温度场演化特征,捕捉岩石失稳的前兆信息,对5种层理倾角片麻岩开展单轴压缩试验,结果表明:随着层理倾角增加,峰值强度先降后升,60°时片麻岩的层理结构效应最明显;相同倾角下,随着应力增加,温度场由均匀分布向高温条带集中分布转变,相同应力下,倾角越大的试件可越早观测到高温条带集中分布;同一倾角不同应力时,分形维数、熵值、方差曲线均能有效表达红外辐射温度场的阶段性演化过程,随着岩石释放能量增加,分形维数出现降低,温度场起伏越大,熵值越低,方差越大,分异程度越显著;利用方差求导获得温度场分异速率,超出阈值界线定义为预警信号,倾角为30°,90°的试件,时间预警早于应力预警,倾角为0°,45°,60°的试件,应力预警稍早于时间预警。In order to explore the rupture instability and infrared radiation temperature field evolution characteristics of different bedding dip gneisses,and to capture the precursor information of rock instability,uniaxial compression tests were carried out on five types of bedding dip gneiss.The results showed that,with the increase of bedding dip angle,the peak strength showed a trend of first decreasing and then increasing.The bedding structure effect of the peak strength of gneiss at 60°was the most obvious.Under the same inclination angles,the temperature field changed from uniform to concentrated distribution with the increase of stress.Under the same stress,the larger the inclination angle was,the sooner the concentrated distribution of high temperature bands could be observed.Fractal dimension,entropy and variance could effectively express the evolution processes of infrared radiation temperature field at the same inclination and different stress.The fractal dimension decreased as the energy released by the rock increases.The entropy decreased with the temperature field’s larger fluctuation.The differentiation of temperature field was more significant with the larger variance.The variance was derived to obtain the temperature field differentiation rate.The differentiation rate exceeding the threshold was defined as an early warning signal.As the angle of sample was 30°or 90°,time warnings were earlier than the stress warning,and as the angle of sample was 0°,45°or 60°,stress warnings were slightly earlier than the time warning.

关 键 词：层理效应 倾角 片麻岩 红外辐射 预警特征信号 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]