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Nonlinearanalysisanddesignofsurfaceanti - seepagepolyureacoating
consideringmultipleactioneffects
LIBingqi,ZHANGJilei,LIUXiaonan,MENGTianyi
(StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,
ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100038,China)
Abstract:Thepolyureaanti - seepagecoatingsystem hasbeenextensivelyusedinhydraulicstructuresduetoits
superiorlong - term durabilityandmechanicalproperties,andfinerobustnesstoconstructionsurfacesincontrast
withpolyurethanecoating.Inviewofthelackofstructuraldesigntheoryforpolyureacoatingsystem,theexperi
ence - baseddesignmethodcommonlyusedmayleadtounsafe ,unreasonableanduneconomicresults.Inthisstudy,
thekeytheoryconcerningthenonlinearanalysisofsurfaceanti - seepagepolyureacoatingwasdiscussed,anda
nonlinearFEM modelswasbuilttoinvestigatethemechanicalbehavior,peelingbehavior,andfailuremodeofthe
polyureacoatingundervariousconditions,suchassubstratesurfacefracturing,surfacehydraulicpressure,and
jointdeformation.Themainconclusionsareasfollows :(i)Concerningthecombinedsubstratesurfacefractureand
hydraulicpressurecondition ,thepeeledcoatingatthecracklocationexhibitsatensile - bendingstressstate.(ii)
Coatingmaterialdamagemayoccuratthestressconcentrationpoint.(iii)Themaximum stressincreaseswiththe
increaseofthehydraulicpressureandcohesivestrength,andthepeelinglengthofthecoatingdecreaseswiththe
increaseofcohesivestrengthandincreaseswiththeincreaseoffracturewidth.(iv)Concerningthejointdeformation
condition ,thepeelinglengthincreaseswiththecoatingthicknessandjointdeformationwidth,andthepeeling
lengthdecreaseswiththecohesivestrength.(v)Themaximumstressincreaseswiththecoatingthickness,cohesive
strengthandthehydraulicpressure.Finally,theframeofdesignandsimpledesignprogramwereproposed.
Keywords:polyureacoating;surfacefracturing;jointdeformation;numericalsimulation;coatingstructuraldesign
(责任编辑:韩 昆)
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