电法在堤坝、深埋长隧道、突水灾害等工程勘察中的应用(底青云).ppt

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1、电法在堤坝、深埋长隧道、突水灾害等工程勘察中的应用底青云、王若、王光杰等中国科学院地质与地球物理研究所2008年11月1日报告内容：----高密度电阻率成像系统（RT)----CSAMT反演和勘察应用高密度电阻率成像(ResistivityTomography,RT)Depth:0~200mFig.1Thearrangementofelectrodesfora2-Delectricalsurveyandthesequenceofmeasurementsusedtobuildupapseudo-sectionElectrodeNumberC

2、1P2P1C2Station1ResistivityMeterLaptopComputerC1P1P2C22a2a2aStation181220345678910111213141918171615aaa.........................................................11832435156DataLeveln=1n=2n=3n=4n=5n=6C1P1P2C23a3a3aStation32RTwithZhodymethodFig.2Singlehighresistivitybody(a)Mo

3、del;(b)RTresultZhodymethodisonekindofiterationinversionprocedure,Theiterationequationis:Distance/mDistance/mDepth/mDepth/mρ/Ωmρ/ΩmFig.3ThefaultmodelandRTsectionsModel;(b)RTsection.Theinversionresulthasaverygoodmatchtothemodel.RTwithIntegralmethodThesensitiveequationofpote

4、ntialchangingwithmediaresistivityis:Theinversionequationis:45ResultinDa-yeofShanDongofChinaThepurposefordamRTexplorationistofindthewaterleakingpositionStation/mSealevel/mSealevel/mSealevel/mStation/mStation/mρ/ΩmA:Dambody,B:weatheredlayer,C:baserockFig.6Fourresistivityima

5、gingsectionsforBa-shandamFigure(a)and(b)arethetwoparallelprofileswiththespace20matthesamepositionofthedam;Figure(c)and(d)aretheothertwoparallelprofileswiththespace20matanotherpositionofthedam.ThepositionoftheancientriverBa-shanDam2.CSAMT数据反演及工程勘察(ControlSourceAudio-Freque

6、ncyMagnetotelluric,CSAMT)Depth:0~1500mFrequency:0.25Hz~10kHzDepth:0~1500mPower:30kw2.1CSAMTworkingconfigurationandparametersABR△Tx△△△△△△Rx△△△△△△NMFig.8CSAMT工作示意图2.2SomeCSAMTresearchworkCSAMT勘察中突出的问题是：近场问题静态问题地形问题ThewholefrequencydomainresistivitycorrectionK3layersmediaBef

7、orecorrectionAftercorrectionMTCurveHK4layersmediaNearfieldcorrectionMTCurveBeforecorrectionAftercorrectionFig.9CSAMT近场校正FiltermethodEMAPmethodCurvesshiftmethod2.5DFEMinversion(a)(b)(c)(d)(e)静态引起的条带异常StaticcorrectionConclude：Thecorrectioneffectwithcurveshiftmethodand2.5DFE

8、Misbetter.1Dinversionbeforecorrection1DinversionafterEMAPcorrection1Dinversionwithcurveshiftcorr