Page 111 - 2023年第54卷第9期
P. 111
Experimentalstudyonpredictionmodeloffrostprotectiondepthofembankmentin
coldregionsconsideringtheinfluenceofradiation
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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
(责任编辑:韩 昆)
(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
(责任编辑:韩 昆)
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