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1、坑道无线电波透析相位层析成像技术第23卷第9期中国有色金属学报?2013年9月?Vol.23?No.9?The?Chinese?Journal?of?Nonferrous?Metals?Sep.?2013?文章编号:1004?0609201309?2371?08?坑道无线电波透视相位层析成像技术1?1?1,2?刘志新?,刘树才?,王东伟?1.?中国矿业大学资源与地球科学学院,徐州?221116;2.?河南省地矿局第二地质勘查院,郑州?450000?摘要:以麦克斯韦方程组为基础,推导出平面电磁波的波动方程。电磁波在煤层中传播时,相位随着电磁波的传播产生一定的滞后。当异常体和煤层的相
2、位系数不同时,坑道无线电波透视发射点和接收点之间的相位差发生变化,相位差成为异常体相位参数层析成像的基础。利用时域有限差分算法对含有陷落柱、火成岩侵入区的两种地电模型进行正演模拟。结果表明:工作面内的异常体改变了发射点和接收点之间的相位差,相位差的大小随着异常体的规模、电阻率和介电常数的不同而不同。用代数重建法分别对陷落柱和火成岩侵入区进行相位系数反演,两种异常体的位置与模型中的实际位置相符。异常体的电磁参数不同,反演的相位系数值也不相同。相位系数层析成像可以用来反演工作面内的地质异常体。关键词:无线电波透视;相位系数;层析成像;地质异常体;电阻率;介电常数中图分类号:P631.
3、3?文献标志码:A?Phase?tomography?technology?of?tunnel?radio?wave?perspective?1?1?1,?2?LIU?Zhi?xin?,?LIU?Shu?cai?,?WANG?Dong?wei?1.School?of?Resource?and?Earth?Science,?China?University?of?Mining?&?Technology,?Xuzhou?221116,?China2.?TheSecond?Geological?Exploration?Institute?of?Henan?Bureau?of?Geolo
4、gy,?Zhengzhou?450000,?China?Abstract:?Based?on?well's?equations,?the?wave?equation?of?plane?electromagnetic?wave?was?derived.?Phase?produces?a?certain?lag?when?electromagnetic?waves?propagate?in?coal?seamPhase?difference?of?tunnel?radio?waves?perspective?between?transmitting?and?receiving?poi
5、nt?changes?when?the?phase?coefficients?of?anomalous?body?and?coal?seam?are?different,?and?it?becomes?the?foundation?of?phase?parameter?tomography?of?anomalies.?FDTD?algorithm?was?calculated?for?two?geoelectric?model?forward?modeling?containing?collapse?column?and?igneous?intrusions.?The?resul
6、ts?show?thatthe?anomalous?body?in?coal?seam?changes?the?phase?difference?between?the?launch?point?and?the?receiving?point?and?the?effect?of?phase?difference?varies?with?abnormal?body?size,?resistivity?and?dielectric?constantThe?inversion?of?phase?coefficient?of?collapse?column?and?igneous?int
7、rusions?was?calculated?using?algebraic?reconstruction?technique?and?the?geological?abnormal?body?position?matches?the?actual?location?of?the?model.?The?phase?coefficientsare?different?because?the?electromagnetic?parameters?of?the?abnormal?are
