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岩石破裂时电磁辐射的机理研究
引用本文:朱元清,罗祥麟.岩石破裂时电磁辐射的机理研究[J].地球物理学报,1991,34(5):594-601.
作者姓名:朱元清  罗祥麟
作者单位:1. 上海市地震局, 上海 200062; 2. 北京航空工程技术研究中心, 北京 100076; 3. 中国科学技术大学地球和空间科学系, 合肥 230026
摘    要:本文提出了岩石破裂时的电磁辐射是裂纹尖端电荷随着裂纹加速扩展运动所产生的假说.应用断裂力学方法推导了岩石破裂时初始裂纹长度与裂纹扩展加速度的关系,并计算了其速度和加速度值.根据破裂岩石的电子发射理论,解释了裂纹尖端带电荷的现象.利用岩石在单轴压缩致裂过程中记录到的近场电磁辐射的实验结果,计算了裂纹扩展时裂纹尖端的电荷量和远场电磁辐射强度.通过对电磁辐射波谱分析的研究,得到岩石破裂时电磁辐射频率上限的估计值.最后对岩石破裂时出现的声光电磁现象在理论上作了统一的定性的解释.

关 键 词:裂纹尖端  裂纹扩展  电磁辐射  
收稿时间:1989-11-29

A STUDY OF MECHANISM ON ELECTROMAGNETIC EMISSION ASSOCIATED WITH ROCK FRACTURE
ZHU YUAN-QING Luo XIANG-LIN' Guo ZI-QIANG ZHAO ZHI-GUANG ZHU ZHONG-WEI Shanghai Seismological Bureau,Shanghai Beijing Research Center of Aviation Engineering Technique,Beijing Dept. of Earth arid Space Science,University of Science and Technology of China,Hefei 's.A STUDY OF MECHANISM ON ELECTROMAGNETIC EMISSION ASSOCIATED WITH ROCK FRACTURE[J].Chinese Journal of Geophysics,1991,34(5):594-601.
Authors:ZHU YUAN-QING Luo XIANG-LIN' Guo ZI-QIANG ZHAO ZHI-GUANG ZHU ZHONG-WEI Shanghai Seismological Bureau  Shanghai Beijing Research Center of Aviation Engineering Technique  Beijing Dept of Earth arid Space Science  University of Science and Technology of China  Hefei 's
Institution:1. Shanghai Seismological Bureau, Shanghai 200062; 2. Beijing Research Center of Aviation Engineering Technique, Beijing 100076; 3. Dept. of Earth arid Space Science, University of Science and Technology of China, Hefei, 230026
Abstract:A new idea that the distribution movement of electric charge in the crack tip end being associated with rock fracture propagation produces electromagnetic emission was brought up.The relation between initial length of crack and velocity and/or acceleration of crack propagation has been derived and calculated. According to the mechanism of electron emission of rock fracture, the phenomenonthat there is electric charge in the crack tip end can be explained. Some experiment results havebeen applied to estimate the quantity of electron charge in the crack tip end and the strengthof electromagnetic radiation. The top-frequency of electromagnetic radiation of rock fracturehas been estimated by means of spectrum theory and by experiment results.Finally, the phenomena of electromagnetic emission, electron emission, light emission andacoustic emission during rock fracture have been explained uniformly and theoretically.
Keywords:Electromagnetic emission  Crack tip end  Crack propagation  
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