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Evolutionlawofleakagedissolutionofconcretecutoffwallofembankments
GANLei,CHENGuanyun,SHENZhenzhong,XULiqun
(CollegeofWaterConservancyandHydropowerEngineering,HohaiUniversity,Nanjing 210098,China)
Abstract:Concretecutoffwallisacommonimpermeablestructureofembankment.Itsleakagedissolutionprocess
isdifferentfromthegeneralcontactdissolution,whichhasasignificantinfluenceonthelong - term characteristics
andservicelifeofconcretecutoffwall.Theleakagedissolutioncouplingmodelofconcretecutoffwallwasproposed
basedonfluiddynamics ,convection - diffusionequationandchemicaldynamicstheories,consideringtheinfluence
ofporosity,aggregateandconvectionondiffusioncoefficient.Therationalityofthemodelwasverifiedbythere
sultsofconcretecorrosiontest.COMSOLMultiphysicssoftwarewasusedtoestablishtheseepagedissolutioncalcu
lationmodelofanembankment,andtheinfluenceofcalciumionleachingontheporosityandseepagecharacteris
ticsofconcretecutoffwallwasstudied.Then,theservicelifeofconcretecutoffwalloftheembankmentwaspro
posed.Theresultsshowthatthemodelcanreflectthechangesofporosityandseepagecharacteristicsduringthe
dissolutionprocessofthecutoffwall.Theproposedmodelcanalsobeusedtopredicttheattenuationprocessofthe
impermeabilityofthecutoffwall.Theannualaveragechangerateofcalciumionconcentrationinthecutoffwallwas
3
about0.03mol? (m·a).Theporosityoftheconcretecutoffwallwasabout0.33after100yearsofdissolution.Com
paredwiththeinitialtime ,thepermeabilitycoefficientofthecutoffwallincreasedbyabout35times,andtheunit
dischargeofthedambodyanddamfoundationincreasedby0.5times.Theservicelifeofconcretecutoffwallwas
44years.Theresearchresultscanprovidetheoreticalsupportforlong - termserviceperformanceevaluationofdam
engineering.
Keywords:embankment;concretecutoffwall;leakagedissolution;impermeability;servicelife
(责任编辑:韩 昆)
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