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                              Seepageanddissolutionanalysesforimperviousstructureofdam
                                   foundationinsuper - highrockfilldamswithsoilcore

                                                                                     1,2
                           1
                                                                          1,3
                                           1
                                                             1,2
                  XULiqun,ZHAOShaofeng,SHENZhenzhong ,LIUDetan ,GANLei ,ZHANGZhiyin                   4
                          (1.CollegeofWaterConservancyandHydropowerEngineering,HohaiUniversity,Nanjing210098,China;
                    2.StateKeyLaboratoryofHydrology - WaterResourcesandHydraulicEngineering,HohaiUniversity,Nanjing210098,China;
                            3.DatangHydropowerScience&TechnologyResearchInstituteCo.,Ltd.,Nanning530007,China;
                                  4.DatangInternationalGanziHydroelectricCo.,Ltd,Kangding626001,China)
                  Abstract:Inordertoinvestigatetheseepageanddissolutioncharacteristicsofsuper - highrockfilldamswithsoil
                  coreundertheseepage - dissolutioneffect ,aseepage - dissolutioncouplingmodelwiththreedegreesoffreedomthat
                  areporewaterpressure ,solidcalciumconcentration,andcalcium ionconcentrationwasproposed.Theaccuracy
                  oftheseepage - dissolutioncouplingmodelwasverifiedviasomeexistingexperiments.Then,themodelwasem
                  ployedtoimplementtheseepageanddissolutionanalysesoftheChangheDamproject.Theretirementindexofthe
                  super - highrockfilldamwithsoilcorewasdiscussedtoforecasttheservicelifeofthedam.Itwasdemonstratedthat
                  theseepage - dissolutioneffectreducestheanti - seepagecapacityofthedam.Thespillpointofthephreaticlineis
                  raisedby1.95m.Withtheincreaseinservicetime ,theanti - seepagecurtainisgraduallyreducedbytheauxilia
                  rycutoffwall.Also ,thehydraulicgradientoftheoverburdenlayerandauxiliarycutoffwallincreaseswhilethehy
                  draulicgradientofthecorewall ,themaincutoffwallandtheanti - seepagecurtaindecrease.Ithasahighanduni
                  formdegreethatcement - basedmaterialsaremiddleandlowerpartsoftwocutoffwalls ,anti - seepagecurtain,and
                  downstreamsideofconsolidationgrouting,whilethedissolutiondegreeofothercement - basedmaterialsnearthe
                  compositegeomembraneandhighlyplasticclayisrelativelylow.Accordingtothedecompositionrateofsolidcalci
                  um,growthmultipleofpermeabilitycoefficient,seepagedischarge,hydraulicgradient,andslopestability,the
                  servicelifeofChangheDamisregardedas68.3years.Reducingtheinitialpermeabilityofthemainanti - seepage
                  curtaincanmoreeffectivelyextendtheservicelifeofthedam.Theresultssuggestthattheseepage - dissolution
                  effectofcement - basedstructuresindamfoundationisessentialforsuper - highrockfilldamswithsoilcore,andthe
                  seepage - dissolutioneffectofcement - basedmaterialsshouldbeconsideredindesign ,operation,andmaintenance.
                  Keywords:seepage - dissolutioncouplingmodel;cement - basedmaterials;imperviousstructureofdam founda
                  tion ;rockfilldams;servicelife;ChangheDam


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