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1、坑道無線電波透析相位層析成像技術第23卷第9期中國有色金屬學報?2013年9月?Vol.23?No.9?The?Chinese?Journal?of?Nonferrous?Metals?Sep.?2013?文章編號:1004?0609201309?2371?08?坑道無線電波透視相位層析成像技術1?1?1,2?劉志新?,劉樹才?,王東偉?1.?中國礦業(yè)大學資源與地球科學學院,徐州?221116;2.?河南省地礦局第二地質(zhì)勘查院,鄭州?450000?摘要:以麥克斯韋方程組為基礎,推導出平面電磁波的波動方程。電磁波在煤層中傳播時,相位隨著電磁波的傳播產(chǎn)生一定的滯后。當異常體和煤層的相
2、位系數(shù)不同時,坑道無線電波透視發(fā)射點和接收點之間的相位差發(fā)生變化,相位差成為異常體相位參數(shù)層析成像的基礎。利用時域有限差分算法對含有陷落柱、火成巖侵入?yún)^(qū)的兩種地電模型進行正演模擬。結果表明:工作面內(nèi)的異常體改變了發(fā)射點和接收點之間的相位差,相位差的大小隨著異常體的規(guī)模、電阻率和介電常數(shù)的不同而不同。用代數(shù)重建法分別對陷落柱和火成巖侵入?yún)^(qū)進行相位系數(shù)反演,兩種異常體的位置與模型中的實際位置相符。異常體的電磁參數(shù)不同,反演的相位系數(shù)值也不相同。相位系數(shù)層析成像可以用來反演工作面內(nèi)的地質(zhì)異常體。關鍵詞:無線電波透視;相位系數(shù);層析成像;地質(zhì)異常體;電阻率;介電常數(shù)中圖分類號:P631.
3、3?文獻標志碼: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
