煤蠕变过程电磁辐射频谱特征实验研究  

Experimental study on the spectral characteristics of electromagnetic radiation during creep process of coal

作　　者：范鹏宏 聂百胜 FAN Penghong;NIE Baisheng(Department of Mining Engineering,Shanxi Institute of Technology,Yangquan,Shanxi 045000,China;The Cultivation Base of Shanxi Key Laboratory of Mining Area Ecological Restoration and Solid Wastes Utilization,Shanxi Institute of Technology,Yangquan,Shanxi 045000,China;State Key Laboratory of Coal Mine Disaster Dynamics and Control,School of Resources and Safety Engineering,Chongqing University,Shapingba,Chongqing 400044,China;School of Emergency Management and Safety Engineering,China University of Mining and Technology-Beijing,Haidian,Beijing 100083,China)

机构地区：[1]山西工程技术学院矿业工程系,山西省阳泉市045000 [2]山西工程技术学院矿区生态修复与固废资源化厅市共建山西省重点实验室培育基地,山西省阳泉市045000 [3]重庆大学资源与安全学院煤矿灾害动力学与控制国家重点实验室,重庆市沙坪坝区400044 [4]中国矿业大学〈北京〉应急管理与安全工程学院,北京市海淀区100083

出　　处：《中国煤炭》2024年第7期105-114,共10页China Coal

基　　金：山西省高等学校科技创新项目(2020L0723);阳泉市科技局重点研发计划项目(2020YF039);山西工程技术学院校级科研启动项目(2021QD-05)。

摘　　要：为了研究煤在单轴蠕变加载条件下,电磁辐射频谱变化的响应规律,分别测试了不同煤种在单轴载荷下,垂直层理方向上短时蠕变过程中全阶段的电磁辐射频谱的变化特征,并讨论了其变化规律。研究结果表明,在单轴蠕变分级加载的过程中,煤体的电磁辐射频率及其振幅总体趋势出现了相似的变化规律,并且各个阶段的频率及其振幅也有各自相似的变化规律。在整个蠕变过程中煤体的电磁辐射信号频率整体处在低频阶段,主要集中于0~0.5 MHz,且加速蠕变变形阶段的电磁辐射频带范围大于减速和等速蠕变变形阶段。在减速和等速蠕变变形期,煤体的电磁辐射频率的振幅变化均处在低振幅阶段;在加速蠕变变形期,可能由于煤体损伤的加剧,使得电磁辐射频率的振幅变化出现较大幅度的波动;在加速蠕变变形末期直到样品临近断裂前,煤体的电磁辐射频率的振幅值会出现增大减小增大的趋势。研究结果可为煤岩流变突变过程中损伤破坏信息的准确感知及煤岩动力灾害的智能监测与预警提供一定的实验和理论依据。In order to study the response law of electromagnetic radiation spectral changes of coal under uniaxial creep loading conditions,the variation characteristics of electromagnetic radiation spectrum during the entire stage of short-term creep process in the vertical bedding direction of different coal types under uniaxial load were tested,and their variation laws were discussed.The research results indicated that in the process of uniaxial creep step loading,the overall trend of electromagnetic radiation frequency and amplitude of coal body had a similar change law,and the frequency and amplitude of each stage also had their own similar change law.In the whole creep process,the electromagnetic radiation signal frequency of the coal body was in the low frequency stage,mainly concentrated in 0-0.5 MHz,and the electromagnetic radiation frequency band range in the accelerated creep deformation stage was larger than that in the deceleration and constant-velocity creep deformation stages.In the deceleration and constant velocity creep deformation stages,the amplitude changes of electromagnetic radiation frequency were generally in the low amplitude stage.In the accelerated creep deformation stage,due to the exacerbation of coal damage,there were significant fluctuations in the amplitude of electromagnetic radiation frequency.In the late stage of accelerated creep deformation until the sample approaches fracture,the amplitude value of frequency showed a trend of increasing,decreasing,and then increasing.The research results can provide certain experimental and theoretical basis for the accurate perception of damage and failure information during the rheological mutation process of coal and rock,as well as the intelligent monitoring and warning of coal and rock dynamic disasters.

关 键 词：煤岩动力灾害 单轴分级加载 短时蠕变 电磁辐射 频谱特征 

分 类 号：TD315.1[矿业工程—矿井建设]