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Elasticfrozensoilfoundationbeam modelfortrapezoidalcanallined
withconcreteprecastslabsincoldregions
4
5
1
1
2,3
1
XIAOMin,WANGZhengzhong ,WULang,CUIHao,YANGXiaosong,GEJianrui
(1.CollegeofArchitecturalEngineering,JiangxiS&TNormalUniversity,Nanchang 330013,China;
2.AridandColdRegionsWaterEngineeringSafetyResearchCenter,KeyLaboratoryofAgriculturalSoilandWaterEngineering
inAridandSemiaridAreasofMinistryofEducation ,NorthwestA&FUniversity,Yangling 712100,China;
3.StateKeyLaboratoryofFrozenSoilEngineering,NorthwestInstituteofEco - EnvironmentandResources,CAS,Lanzhou 730000,China;
4.CollegeofWaterConservancyandConstructionEngineering,TarimUniversity,Alaer 843300,China;
5.CollegeofEnergyandPowerEngineering,LanzhouUniversityofTechnology,Lanzhou 730050,China)
Abstract:BasedonWinklerelasticfoundationbeamtheoryandfinitebeamelementmethod,thedeflectiondiffer
entialequationforasingleprefabricatedslabisputforwardandsolved.Onthisbasis,consideringinteractionbe
tweenfrozensoilandconcreteliningplateandinteractionbetweenprecastslabs ,elasticfrozensoilfoundationbeam
modeloftrapezoidalcanallinedwithprecastslabsisproposedthroughintroducingendboundaryconditions ,conti
nuityconditionsbetweenslabsandconditionsthatbendingmomentonjointsiszero.Thetangentialgoverningequa
tionisderivedfromtangentialstaticequilibriumcondition.Thenanalyticexpressionsforbothnormalandtangential
frostheavedisplacementofconcreteliningplatesarepresented.BytakingatrapezoidalcanalinnorthXinjiangas
prototype,normalfrostheavedisplacement,tangentialdisplacement,normalstressoncontactinterface,tangential
freezingforceanduppersurfacestressofeachsectionofliningplatesarecalculated.Theresultsprovethatthenor
malfrostheavedisplacementcalculatedbythepresentedmethodareingoodagreementwithobservedvalueandis
betterthanthatcalculatedbyelasticsupportmethodandfinitebeamelementmethod.Thecrackingrangeestimated
byanalyzingdistributionofuppersurfacestressofliningplateisbasicallyconsistentwithfieldinvestigation.Dueto
discontinuityofliningplates ,distributionofnormalfrostheavedisplacement,stressoncontactinterface,bending
momentanduppersurfacestressofconcreteliningplatesallshowsomefluctuations ,andtherearepositiveand
negativealternatingphenomena.Thereistangentialdisplacementineachcross - sectionofslopeplateofthecanal
causedbypushingforce ,andtangentialdisplacementdecreasesnonlinearlyfromslopetoetothetopofslop,then
theminimumisreachedatthetopoftheslopeplate.
Keywords:frozensoilengineering; canallinedwithconcreteprecastslabs; frostheave; elasticfoundation
beam ;analyticsolution
(责任编辑:韩 昆)
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