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改进剑桥土蠕变模型分析
Introduction
TheCambridgesoilmodelisacomplexmathematicalmodelusedtopredictthedeformationofsoilsunderloadingconditions.Ithasbeenwidelyusedinthegeotechnicalengineeringcommunitysinceitsdevelopmentinthe1970sbuthasundergoneseveralimprovementsandmodificationstoincreaseitsaccuracy.ThispaperaimstodiscusssomeofthekeymodificationsmadetotheCambridgemodelandtheireffectsonitsaccuracywhenanalyzingsoildeformation.
Background
Thebasicassumptionofsoildeformationmodelingisthatthesoilisacontinuumandcanbetreatedasamaterialthatcanbedeformedunderload.Thedeformationiscausedbyavarietyoffactors,includingtheamountofstressappliedtothesoil,thesoiltype,andthesoil’sproperties.Toproperlymodelthedeformationofsoil,itisnecessarytoaccuratelycapturethebehaviorofthesoilundervariousloadconditions.
TheoriginalCambridgesoilmodelwasoneofthefirstmodelsusedforsoildeformationanalysis.Itconsistsofseveralcomponentsthatrepresentthedifferentcharacteristicsofsoildeformation,includingtheelasticmodulus,plasticity,andcreep.
Inrecentyears,severalmodificationshavebeenmadetotheoriginalCambridgemodeltoimproveitsaccuracyandapplicabilityinvariousgeotechnicalanalyses.Thesemodificationsincludeupdatestothecreepparameters,theincorporationoftheanisotropyofsoilfabric,andtheadaptationofthemodeltosimulatethebehaviorofunsaturatedsoils.
ModificationstotheCambridgeSoilModel
CreepParameters
OneofthemostsignificantmodificationstotheCambridgemodelwastheintroductionofnewparametersthatcontrolcreepbehavior.Creepisaslowdeformationunderasustainedloadandisanessentialfactorinpredictingthelong-termbehaviorofsoilstructures.Theupdatedmodelincludesmodifiedcreepparametersthatbetterreflectthecharacteristicsofnaturalsoils.
AnisotropyofSoilFabric
Theanisotropyofsoilfabrichasasignificantimpactonthedeformationcharacteristicsofsoil.TheoriginalCambridgemodelassumedthatthesoilisisotropicandthatitsdeformationcharacteristicsarethesameinalldirections.However,thisisnotalwaysthecaseinnaturalsoildeposits.Toaccountforsoilanisotropy,theupdatedmodelinco