摘要
红外热像法是一种评估煤岩损伤有广阔应用前景的手段。通过红外热像中的关键信息进行识别和提取,从而对煤岩损伤状态进行判别。本文对岩样进行了单轴加载,同步采集红外热像和岩样表面裂隙发育图,采用归一化直方图的方式对红外热像进行了分析处理,并利用不同灰度值区间的像素占比对红外热像的细节信息进行了定量表征。结果表明,不同时刻红外热像的灰度值分布能良好反映试样受载破坏过程表面温度和应力值的变化,在主破裂发生时,灰度值区间[240,255](岩样表面温度29.01℃~33.19℃)的像素点百分比较上一时刻增加13.85个百分点。另外,灰度值区间[224,255]的像素占比随时间的变化趋势与岩样损伤变量呈高度相关性,这表明基于归一化直方图的红外热像能够很好表征岩样损伤破坏过程。
Infrared thermal imaging is a very promising method for evaluating coal and rock damage.To further process the infrared image and extract the key information,the damage status of coal and rock can be distinguished according to this quantitative information.With uniaxial loading,fracture development maps were developed,and synchronous acquisition of infrared images of the rock samples was carried out.The infrared images were analyzed and processed using a normalized histogram,and the details of the infrared images were quantitatively characterized.The results show that the gray value distribution of the infrared images at different times can reflect the surface temperature changes and stress values during the failure process of the sample.When the main fracture occurred,the percentage of pixels in the gray value interval[240,255](the surface temperature of the rock sample was 29.01℃-33.19℃)increased by 13.85%compared with that in the previous moment.In addition,the change trend of the proportion of pixels in the gray value interval[224,255]over time is highly correlated with rock damage variables,which shows that the normalized histogram can characterize the damage and destruction process of the rock mass.
作者
宋晶晶
李忠辉
张昕
田贺
郑安琪
臧泽升
张全聪
SONG Jingjing;LI Zhonghui;ZHANG Xin;TIAN He;ZHENG Anqi;ZANG Zesheng;ZHANG Quancong(Key Laboratory of Gas and Fire Control for Coal Mines of Ministry of Education,China University of Mining and Technology,Xuzhou 221116,China;National Engineering Research Center for Coal Gas Control,China University of Mining and Technology,Xuzhou 221116,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China)
出处
《红外技术》
CSCD
北大核心
2021年第8期777-783,共7页
Infrared Technology
基金
国家自然科学基金项目(51674254,51934007)
山东省重大科技创新工程项目(2019JZZY020505)
江苏高校优势学科建设工程资助项目(PAPD)。
关键词
红外热像
归一化直方图
灰度值
岩样损伤
infrared thermal image
normalized histogram
gray value
rock sample damage
作者简介
宋晶晶(1996-),女,山西大同人,硕士研究生,研究方向为煤岩动力灾害地球物理信息及监测预警。E-mail:ts19120094p31@cumt.edu.cn;通信作者:李忠辉(1978-),男,河北省高邑县人,教授,博士生导师,研究方向为煤岩动力灾害过程监测及预警、煤与瓦斯突出防治与瓦斯抽采、安全监测预警大数据分析及智能预警等。E-mail:leezhonghui@163.com。
