水泥路面缺陷的探测研究

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1、ConcretePavementforwardComputationofGPRwithFDTDShengZhangGeotechnicalEngineeringInstituteAnhuiCommunicationConsulting&DesignInstituteHefei,Chinazhang.sheng@263•netAbstract—Thispaperprovidestheimplementingprocedureoffinite-differenceintimedomain(FDTD)forforwardcomputationofGrou

2、nd-penetratingradar(GPR).Theproposedmethodisimplementedbytakingintoaccountthestabilitycriterionandtheperfectmatchedlayer(PML)andusingtheMATLABcode.ThecodeappliedinmodelingtheGPRforPavementdetectionsuchasnon-dcfcctspavement,theconcretethicknesschangeofpavementandcavityinconcret

3、epavement，resultsshows(hecodeisfeasibilityandreasonfortheconcretepavementforwardcomputationofGPR.Keywords-ground-penetratingradar(GPR);finite-differenceintimedomain(FDTD);perfectmatchedlayer(PML);forwardcomputationI.IntroductionGround-penetratingradar(GPR)hasbeenusedoverthelas

4、tthreedecadesasarapid，non-destructiveandnon-invasivctechnique,whichcanbeusedtoobtaininformationaboutamedium.Thisinformationincludesdiversefeaturessuchaslayerthickness[1].GPRsurveysonroadsarewidelyusedinChina,Canada,France,Italy，SwitzerlandandtheUKetc[2].GPRisahigh-frequencyele

5、ctromagnetictechniqueusedingeophysicalexploration.Thistechniqueinvolvestheemissionofanelectromagneticwavethattravelsthroughthemedium.Thesignalsreflectedbysharpchangesintheelectromagneticpropertiesofthematerials,whichisrecordedbytheradarsystem(Figure1).Ourworkisthestudyofconcre

6、tepavementmodelinginGPRproblems.ThenumericalmodelingofcompleteGPRsystemscanbedonebyusingtheJuncaiXuCollegeofWaterConservancy&HydroelectricEngineeringHohaiUniversityNanjing，Chinajuncaixu@yahoo.com.cnFinite-differenceintimedomain(FDTD)algorithms[3].Thismethodisthemostcompatiblen

7、umericaltechniqueintheanalysisofGPRsystemsandsubsurfacescatteringmechanisms.Thereasonforthisconvenienceistheeasymodelingofthemultilayerproblemspaceandlargenumberofdifferentmediaembeddedinit[4].BecauseMATLABhasevolvedtoembedalargecollectionofstate-of-the-artnumericaltools，highq

8、ualitygraphics，object-orientedextensions[5]wechooseMATLABasou