岩体中电磁辐射信号的产生与传播
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摘要
从压电效应机制出发,研究岩体在应力波作用下电磁辐射的传播规律。研究结果表明,岩体中电磁辐射随岩体的初始损伤增大而减小,随传播距离发生衰减,在应力波源处信号最强;随压电系数以及岩体的波阻抗增大而增大;随电阻率增大而增大,相对其它4个参数而言,其影响幅值较小。研究结果与现有的室内实验及现场观测结果相吻合。
From the point of view of piezoelectric effect,the propagation law of electromagnetic emission(EME) in the rock under stress wave was investigated.The results showed that with the increase of rock's initial damage the intensity of EME in rock dropped,the EME attenuated with propagation distance,the EME signal at the site of stress wave generation was the most strong,the EME in rock enhanced with the increase of piezoelectric coefficients,wave impedance and resistivity.Relatively speaking,the effect of resistivity on the EME was the least.The research results are in good agreement with ones obtained in laboratory experiments and field measurements.
From the point of view of piezoelectric effect,the propagation law of electromagnetic emission(EME) in the rock under stress wave was investigated.The results showed that with the increase of rock's initial damage the intensity of EME in rock dropped,the EME attenuated with propagation distance,the EME signal at the site of stress wave generation was the most strong,the EME in rock enhanced with the increase of piezoelectric coefficients,wave impedance and resistivity.Relatively speaking,the effect of resistivity on the EME was the least.The research results are in good agreement with ones obtained in laboratory experiments and field measurements.
引文
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[14]王其胜,万国香,李夕兵.动静组合加载下岩石破坏的声发射实验[J].爆炸与冲击,2010,(3).
[15]金安忠,赵强,姜枚,等.小尺度岩石爆破引起电磁辐射的野外实验观测结果[J].地震学报,1997,19(1):45-50.
[2]郑联达.地震电磁波发射的一种机制[J].地震学报,1990,12(1):78-85.
[3]Ogawa T,Utada H.An analytic far and early-time field solutionin a homogeneous whole space[J].Phys Earth Planet Inter,2000,121:273-288.
[4]钱书清,任克新,吕智.伴随岩石破裂的VLF,MF,HF和VHF电磁辐射特性的实验研究[J].地震学报,1996,18(3):346-351.
[5]Warwick J W,Stoker C,Meyer T R.Radio emission associatedwith rock fracture:possible application to the great Chilean earth-quake of May22,1960[J].J.Geophys.Res,1982,87:1859-2581.
[6]Yoshida S,Manjgaladze P,Zilpimiani D,et al.Electromagnetic e-missions associated with frictional sliding of rock[M].Tokyo:E-lectromagnetic Phenomena related to earthquake prediction terrascientific publishing company,1994:307-322.
[7]Nitsan U.Electromagnetic emission accompanying fracture ofquartz-bearing rocks[J].Geophysics research letters,1977,(4):333-336.
[8]Koshevaya S,Makarets N,Grimalsky V,et al.Spectrum of theseismic-electromagnetic and acoustic waves caused by seismicand volcano activity[J].Natural Hazards and Earth System Sci-ences,2005,5:203-209.
[9]刘煜洲,刘因,王寅生,等.岩石破裂时电磁辐射的影响因素和机理[J].地震学报,1997,19(4):418-425.
[10]B.A.奥尔特.固体中的声场和波[M].孙承平.北京:科学出版社,1982.
[11]赵统武.冲击动力学[M].北京:冶金工业出版社,1996.
[12]WAN Guoxiang,LI Xibing,HONG Liang.Piezoelectric respon-ses of brittle rock mass containing quartz to static stress and ex-ploding stress wave respectively[J].J.CENT.SOUTH UNIV.TECHNOL,2008,15(3):344-349.
[13]万国香,李夕兵.应力波作用下节理面前后电磁辐射强度的变化[J].地震学报,2009,31(4):411-423.
[14]王其胜,万国香,李夕兵.动静组合加载下岩石破坏的声发射实验[J].爆炸与冲击,2010,(3).
[15]金安忠,赵强,姜枚,等.小尺度岩石爆破引起电磁辐射的野外实验观测结果[J].地震学报,1997,19(1):45-50.
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