瞬变电磁法在铁矿采空区应用的分析——以岚县袁家村铁矿采空区为例

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1、Firstthispaperexpoundsthepresentsituationofthestudyofmined—outareaathomeandabroad，summarizesthedomesticresearchonthedistributionofthemine，andbrieflyintroducesthedevelopmentstatusofthetransientelectromagneticmethod，devicetypesandcharacteristics．Aboutthepositivecalculation，inFaradayelectromagneticindu

2、ction．andonthebasisofusingmaxwell’Sequations，firstfromfrequencydomainstart．thederived，theninHanktransformandcosinetransform，drawbacklineoverlapundergroundtransientelectromagneticresponseformula．Intheprocessofdeducingthemodelingformula，thispaperintroducesthedisplacementcurrent．Atpresentalotofliteratu

3、resignoredisplacementcurrent，butaccordingtomaxwell’Stheorythatdisplacementcurrentcanalsoproducemagneticfields，andaremadebyspinfield，displacementcurrentsaidonlytheelectricdisplacementfluxtherateofchangeovertime，isbychangingtheelectricfieldproduces，nochargeformacrodirectionalmovement，donotproducethejo

4、uleheat．Conductedcurrentconductoronlyflow,anddisplacementcurrentcanexistinachangingelectricfieldexistedmedium，theconductorandavacuum．Inthemediumconductedcurrentissmall，displacementcurrentcanbeverybig．Soweformulasignoreconductedcurrent．Accordingtotheaboveformulasweconductedadoverlapbacklinetransiente

5、lectromagneticmodelingsimulation，thispapermainlyhomogenoushalfthespaceandshapeoftheearththreelayersofthemodel，cansee，mediumdielectricconstant，thebiggerthetransientelectromagneticresponse，thebiggerIVtheinspiredsecondaryvoltage．SomuchforYuanjiacunironorebelongstoinfect，ironore，thedielectricconstantisv

6、erylarge(ore>water>air)，SOsecondaryvoltageisalsostimulatelargestironore，waterissecondsInallest，andminimumair．Thisistransientelectromagneticrnethodofdetectionanddatainterpretationtoprovidebasis．Theendofpaper，Yuanjiacunironoreinpracticalapplicationa。rea，accordingtoresultsofnumericalmodelinganalysisbee

7、xplained．ThenthroughdrillingverificationandthreedimensionalspacescanningfcIundthatexplainscopeofmined—outareasize，thepracticalgoafwithbasicagreementthattransientelectromagneticlookingforironoregoafgoo