坑道无线电波透视相位层析成像技术  

Phase tomography technology of tunnel radio wave perspective

作　　者：刘志新[1] 刘树才[1] 王东伟[1,2] 

机构地区：[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

出　　处：《中国有色金属学报》2013年第9期2371-2378,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家科技支撑计划资助项目(2013BAK06B01);国家重点基础研究发展计划(973)资助项目(2013CB227900)

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。Based on Maxwell＇s equations, the wave equation of plane electromagnetic wave was derived. Phase produces a certain lag when electromagnetic waves propagate in coal seam. Phase difference of tunnel radio waves perspective between transmitting and receiving point 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 results show that the 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 constant. The inversion of phase coefficient of collapse column and igneous intrusions was calculated using algebraic reconstruction technique and the geological abnormal body position matches the actual location of the model. The phase coefficients are different because the electromagnetic parameters of the abnormal are different. The phase coefficient tomography can be used to inverse the geological anomaly within the face body.

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 

分 类 号：P631.3[天文地球—地质矿产勘探]