Page 111 - 2023年第54卷第9期
P. 111

Experimentalstudyonpredictionmodeloffrostprotectiondepthofembankmentin
                                     coldregionsconsideringtheinfluenceofradiation
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                                                                                  2
                             TIANYu ,WANGEnliang,XIEChongbao,RENZhifeng,YUJun               2
                                  (1.ChinaIrrigationandDrainageDevelopmentCenter,Beijing 100032,China;
                       2.CollegeofWaterConservancyandCivilEngineering,NortheastAgriculturalUniversity,Harbin 150030,China)
                  Abstract:Thechangeinfreezingdepthofembankmentsincoldregionsisanimportantfactortobeconsidered
                  whenconstructingembankmentsandensuringthenormaloperationofriverembankments.Inordertoexplorethe
                  impactofsolarradiationonthechangesinfrozendepthofembankmentsincoldregions,thispaperconductedphys
                  icalslopemodelexperimentsusinganindoordesignedsolarradiationsimulator.Theeffectsoftemperature,unfro
                  zenwatercontent,andsolarradiationheatchangesonthedevelopmentofembankmentfrozendepthwerestudied.
                  BPneuralnetworkpredictionmodelsandBPneuralnetworkpredictionmodelsbasedonwhaleoptimizationalgo
                  rithm(WOA)wereestablishedforthefreezingandmeltingcurves,respectively.ComparedwiththeStephenfor
                  mulaandtheimprovedStephenformula,theadvantagesanddisadvantagesoffourpredictionmethodswerepointed
                  out.TheresultsshowthattheBPneuralnetworkbasedonWOA,whichconsiderstheinfluenceofradiation,has
                  betterpredictionperformanceforthedevelopmentoffrostprotectionincoldregions.Itcaneffectivelysolvethe
                  complexnonlinearrelationshipbetweenfrozensoildepthandvariousinfluencingfactors ,andcanprovidereference
                  forthedesignandmaintenanceofcoldregionembankments.
                  Keywords:coldregion;embankment;frozendepth;irradiationfactors;predictionmodel


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              (上接第 1110页)
                                Dynamicresponseanalysisofhighdam- complexfoundation
                                         system undernon - uniform seismicwaves

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                          ZHANGJiawen ,LIMingchao,HANShuai,YANWenyu,ZHANGJingyi
                      (1.StateKeyLaboratoryofHydraulicEngineeringSimulationandSafety,TianjinUniversity,Tianjin 300350,China;
                        2.SmartConstructionLaboratory,DepartmentofBuildingandRealEstate,TheHongKongPolytechnicUniversity,
                                                   HongKong 999077,China)
                  Abstract:Theconstructionandinputofseismicwavefieldsarethekeyfactorsintheseismicanalysisofhigh
                  damstructures.Thispaperproposesatime - domainmethodforsolvingthefreewavefieldunderathree - dimen
                  sionallayeredfoundation.Aremotelayeringinterfacemodelisestablishedtoseparatetheupgoinganddowngoing
                  wavefields,whichcansolvetheconstructionofwavefieldsincomplexgeologicalstructuressuchasirregular
                  sites.Combinedwiththecontinuityandvibrationcharacteristicsofdifferentwavepatterns ,thesinglecolumn
                  nodedisplacementsareextendedtothewholesitebygeometricderivationtoimprovethesolvingefficiency.An
                  improvedwaveinputmethodisusedtoconvertthecomplexwavefieldintotheequivalentnodalforceonthefoun
                  dationboundaries.Theresponseofthe3Dhighdam - foundationsystem underverticalandobliqueincidentSV
                  wavesisstudied,andtheresultsarecomparedwiththoseofhomogeneousfoundations;alltheexamplesarecom
                  pletedonthesupercomputercenterplatform.Theresultsshowthatthedynamicresponseofthedamundernon - u
                  niformseismicwaveshasasignificantspatialdifference,andthemaximumdisplacementresponseatdifferentlo
                  cationsofthedamcrestcanvarybyupto80%.WhentheSVwaveisobliquelyincident,thevibrationresponse
                  ofthedamismuchlargerthanthatoftheverticalincidence :theextremedisplacementvaluecanbedifferentby2
                  - 3times,andthetimeperiodofhighstressareaisdifferentgreatly,andthescopeoftensilecrackingofsystemis
                  wider.Complexgeologicalconditionswillaggravatethedam’sdamageandsignificantlyinfluencethedistributionof
                  high - stressregions.Thispaperprovesthatitisnecessarytoconsiderthenon - uniform characteristicsofseismic
                  wavesandthegeologicalstructureofthesite,whichcanprovideareferencefortheseismicresponseanalysis.
                  Keywords:highdam- complexfoundationsystem; non - uniform seismicwavefield; travelingwaveeffect;
                  obliqueincidenceseismicwave;dynamicresponse;parallelcomputing


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