ChongqingArchitecture54第22卷总第236期收稿日期：2022-11-11作者简介：纪健（1982—），女，汉族，山东青岛人，工学博士，讲师，主要研究方向为管道泄漏检测方法和安全；李坤（1999—），男，汉族，江西南昌人，硕士研究生，专业方向为超声波桩基检测与数值模拟。NumericalSimulationofMulti-physicsFieldforUltrasonicTestingonPileFoundationsJiJian,LiKunAbstract:WiththerapiddevelopmentofChina’sconstructionindustry,thepilefoundationisbeingincreasinglyapplied,andtheintegrityinspectionofapilefoundationisveryimportant.Ultrasonicnondestructivetestingtechnology,owingtoitsadvantagesoflargedetectiondepth,widerange,highsensitivityandfastspeed,hasbeenmostwidelyusedinpilefoundationtesting.However,ultrasonictestinglackstheoreticalsupportforthedeterminationofdefects,resultinginmissedanderroneousjudgments.Inordertoaccuratelyandeffectivelytesttheintegrityofthepilefoundation,atwo-dimensionalnon-destructivetestingmodelforthepilefoundationwasestablishedthroughComsolMultiphysicsfiniteelementanalysissoftware,whichconductsmulti-physicscouplingwithpressureacoustics,solidmechanicsmodulesandpiezoelectriceffects.Theaccuracyoftheultrasonicmodelisverifiedthroughsoundvelocityandwaveform.Themodelsofcavitydefectsofdifferentsizeswereestablished，andtheinfluencelawofcavitysizeonultrasonicpropagationwasproposedthroughtheanalysisonsoundpressureandsoundtime.Basedonthechangeofthecavity’spositiononthecentralaxis,therelativedistancerelationshipbetweensoundpressureandthetransducerisanalyzed,andit’sfoundthatthecavitydefectclosertothetransmittingtransducerhasagreaterinfluencethanclosertothereceivingtransducer.Keywords:ultrasonicwave;non-destructivetesting;ComsolMultiphysics;cavitysize;cavitylocation0引言近年来，无损检测技术在岩土工程领域的应用日益广泛，尤其在桩基完整性检测中，无损检测技术已成为现在至关重要的方法。在对存在缺陷的混凝土灌注桩的检测中，能够更精确地定位出缺陷位置，并进一步判断导致缺陷出现的原因，同时在检测的过程中效率也得到了保证。相比较传统的检测技术，传统的桩基检测主要有静载荷试验、钻芯法等，不但操作复杂，成...
