摘要
为研究煤岩破坏产生的声电信号时域特征及与应力间关系,进行了多种煤样的单轴压缩试验,采集了煤样受载破裂全程的声电信号,统计分析了2种信号的振铃计数和能量参数,研究了电磁辐射信号幅度与应力降之间的关系。结果表明:煤体受载破坏过程中会伴随明显的声发射和电磁辐射信号,电磁辐射相对较少较弱,声电信号的幅度、计数、能量在时域上有很好的一致性;煤岩加载破坏产生的电磁辐射与应力骤降现象有更好的对应性,电磁辐射信号幅度与应力降间呈显著的线性相关关系,更明显的应力下降现象对应产生更强的电磁辐射信号幅度。
In order to study the time-domain characteristics of acoustic emission(AE)and electromagnetic radiation(EMR)signals during coal rock fracture and the relationship between stress and these signals,uniaxial compression experiments of various coal samples were carried out in this paper.During the loading process,AE and EMR signals were acquired synchronously.Then the ringing count and energy parameters of the two signals were statistically analyzed,and the relationship between EMR signal amplitude and stress drop was studied.Experimental results show that:during the process of coal fracture,obvious AE and EMR signals can be detected.Among them,EMR is relatively weak in quantity,and the amplitude,count and energy of AE and EMR signals are consistent in time domain.EMR signals generated by coal fracture have a better correspondence with the phenomenon of stress sudden drop.There is a significant linear correlation between the EMR amplitude and the stress drop.The more obvious stress drop phenomenon corresponds to the stronger amplitude of EMR signal.
作者
徐剑坤
习丹阳
余鑫
XU Jiankun;XI Danyang;YU Xin(School of Mines,China University of Mining and Technology,Xuzhou 221116,China;State Key Laboratory of Coal Resources&Safe Mining,China University of Mining and Technology,Xuzhou 221116,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China)
出处
《煤矿安全》
CAS
北大核心
2019年第10期54-57,共4页
Safety in Coal Mines
基金
国家重点研发计划资助项目（2016YFC0801401）
国家自然科学基金资助项目（51504250）
关键词
煤岩动力灾害
单轴压缩试验
电磁辐射
声发射
应力降
coal rock dynamic disaster
uniaxial compression experiment
electromagnetic radiation
acoustic emission
stress drop
