Lamb波在灌漿套筒中傳播的數(shù)值模擬及分析Lamb波在灌漿套筒中傳播的數(shù)值模擬及分析

摘要：灌漿套筒廣泛應(yīng)用于建筑、航空、航天等領(lǐng)域。然而，灌漿套筒中混凝土裂紋、缺陷和腐蝕對結(jié)構(gòu)的安全性產(chǎn)生重要影響。因此，研究灌漿套筒中缺陷的檢測和診斷方法是一項十分重要的任務(wù)。本文基于波動方程，采用有限元分析方法建立了灌漿套筒-Lamb波數(shù)值模型。利用該模型分析了Lamb波在灌漿套筒中的傳播規(guī)律，探討了Lamb波在灌漿套筒中的應(yīng)用前景。研究結(jié)果表明，灌漿套筒中的Lamb波具有較強(qiáng)的穿透性。在散射、反射和衍射作用下，Lamb波的傳播會受到不同程度的影響。此外，混凝土缺陷和腐蝕對Lamb波的傳播具有明顯的影響，能夠通過Lamb波來檢測和診斷。本研究對于灌漿套筒中缺陷的檢測和評價具有一定實際應(yīng)用價值。

關(guān)鍵詞：灌漿套筒、Lamb波、有限元分析、波動方程、缺陷檢測

Lambwavepropagationingroutedpiles:numericalsimulationandanalysis

Abstract:Groutedpilesarewidelyusedinthefieldsofconstruction,aviation,aerospace,etc.However,concretecracks,defects,andcorrosioningroutedpileshaveasignificantimpactonthesafetyofthestructure.Therefore,studyingdetectionanddiagnosismethodsfordefectsingroutedpilesisanimportanttask.Inthispaper,anumericalmodelofgroutedpiles-Lambwaveisestablishedbasedonthewaveequationandthefiniteelementanalysismethod.ThepropagationlawofLambwavesingroutedpilesisanalyzedusingthemodel,andtheapplicationprospectsofLambwavesingroutedpilesareexplored.TheresultsshowthatLambwavesingroutedpileshavestrongpenetrationability.Undertheeffectsofscattering,reflection,anddiffraction,thepropagationofLambwaveswillbeaffectedtovaryingdegrees.Inaddition,concretedefectsandcorrosionhaveasignificantimpactonthepropagationofLambwaves,whichcanbeusedfordefectdetectionanddiagnosis.Thisstudyhassomepracticalapplicationvaluefordefectdetectionandevaluationingroutedpiles.

Keywords:Groutedpile,Lambwave,Finiteelementanalysis,Waveequation,DefectdetectioThefiniteelementmethod(FEM)wasusedtosimulatethepropagationofLambwavesingroutedpileswithdifferentdefects.ThewaveequationwassolvedbyapplyingtheFEMtomodelthewavepropagationcharacteristicsinaheterogeneousmedium.ThesimulationresultsshowedthatthepropagationofLambwavesingroutedpileswasaffectedbythescattering,reflection,anddiffractioncausedbytheirregularitiesinthemedium.Thepresenceofdefectsinthegroutedpile,suchascracksandvoids,causedachangeintheamplitudeandphaseoftheLambwaves.Furthermore,theresultsdemonstratedthatthecorrelationbetweenthepropagationofLambwavesandthelocationandsizeofdefectswassignificant.

Basedonthesimulationresults,adefectdetectionanddiagnosismethodforgroutedpileswasproposed.ByanalyzingtheamplitudeandphasechangesoftheLambwaves,thelocationandsizeofdefectscanbeaccuratelyidentified.Themethodprovidesanon-destructiveandefficientwayofdetectingdefectsingroutedpiles,thusensuringthesafetyandreliabilityofthepilefoundations.

Insummary,thepropagationofLambwavesingroutedpileswasinvestigatedthroughfiniteelementanalysisinthisstudy.Thesimulationresultsshowedthatscattering,reflection,anddiffractionaffectedthepropagationofLambwaves,andthepresenceofdefectscausedchangesintheamplitudeandphase.TheproposeddefectdetectionanddiagnosismethodbasedonLambwavesprovidesapromisingapproachforpracticalapplicationintheinspectionofgroutedpilesInadditiontotheuseofLambwavesforthedetectionanddiagnosisofdefectsingroutedpiles,otherapplicationsofpilefoundationsarealsoimportanttoconsider.Pilesareusedinavarietyofconstructionprojects,frombuildingsandbridgestooffshorestructuresandwindturbines.Thetypeofpileusedwilldependonthespecificrequirementsoftheproject,includingtheloadcapacityneeded,thegroundconditions,andtheenvironmentalfactorsthatmayimpactthepile'sperformanceovertime.

Onetypeofpilecommonlyusedinconstructionisthedrivenpile.Thesearetypicallymadeofconcreteorsteelandaredrivenintothegroundusingapiledriver.Theinstallationprocessinvolvesstrikingthepilewithaweightedramuntilitreachesthedesireddepthorresistanceinthesoil.Drivenpilesareoftenusedinprojectswhereahighloadcapacityisrequired,suchasintallbuildingsorbridges.

Anothertypeofpileisthedrilledpile,whichiscreatedbydrillingaholeintothegroundandfillingitwithconcreteoranothermaterial.Thesepilesaretypicallyusedinsituationswherethesoilconditionsarepoor,andahigherloadcapacityisneededtosupportthestructure.Drilledpilescanalsobeusedinareaswherenoiseorvibrationsfrompiledrivingwouldbedisruptive.

Inadditiontothesetraditionaltypesofpiles,therearealsonewertechnologiesbeingdevelopedthataimtoimprovetheperformanceandefficiencyofpilefoundations.Onesuchtechnologyistheuseofmicropiles,whicharesmall-diameterpilesthatcanbedrilledintothegroundusingspecializedequipment.Thesepilesareoftenusedinareaswhereaccessislimitedorwheretraditionalpileinstallationmethodsarenotfeasible.

Overall,pilefoundationsareanimportantcomponentofmanyconstructionprojects,andtheirdesignandinstallationmustbecarefullyconsideredtoensurethattheywillprovidetherequiredlevelofsupportandstabilityovertime.Theuseofadvancedtechnologies,suchasLambwavedetectionanddiagnosis,canhelptoimprovethesafetyandlongevityofpilefoundations,andensurethattheymeettheneedsofmodernconstructionprojectsInadditiontothetraditionalpileinstallationmethodsdiscussedearlier,therearealsoavarietyofinnovativetechniquesthathavebeendevelopedtoimprovetheefficiency,speed,andsafetyofpilefoundations.Thesemethodsincludetheuseofprecastpilesthataremanufacturedoffsiteandtransportedtotheconstructionsiteforinstallation,whichcanreduceinstallationtimeandimproveaccuracy.

Anotherinnovationinpileinstallationistheuseofaugercastpiles,whichareinstalledbydrillingaholeintothegroundandthendepositingconcreteintotheholeastheaugeriswithdrawn.Thismethodproducesminimalsoildisplacement,makingitidealforuseinsensitiveenvironmentalareasorwherethereisariskofdamagingnearbystructures.Additionally,theuseofsheetpilesandsoldierpilescanprovideacost-effectivesolutionfortemporaryexcavationsupportandretainingwalls.

Therearealsoemergingtechnologiesthathavethepotentialtorevolutionizethedesignandinstallationofpilefoundations.Onesuchtechnologyis3Dprinting,whichhasthepotentialtoproducecustom-designedpileswithspecificshapesandpropertiesthataretailoredtomeettheexactneedsofaproject.Anotherareaofinnovationistheuseofmachinelearningandartificialintelligence,whichcanhelptooptimizepilefoundationdesignbasedonsite-specificdataandenvironmentalfactors.

Aswithanyconstructionproject,safetyisaparamountconcernwhenitcomestopilefoundationinstallation.Toensurethesafetyofpersonnelandequipmentduringinstallation,appropriatesafetymeasuresmustbeimplemented,suchaspropertrainingofpersonnel,implementationofsafetyproceduresandprotocols,andtheuseofpropersafetyequipmentandgear.

Insummary,pilefoundationsareacriticalcomponentofmanyconstructionprojects,providingthenecessarysupportandstabilitytoensurethelongevityandsafetyofstructures.Whiletraditionalpileinstallationmethodsremainapopula