Page 70 - 2023年第54卷第8期
P. 70
leachingresistance[J].CementandConcreteResearch,1998,28(6):815 - 828.
[35] COCHEPINB,TROTIGNONL,BILDSTEINO,etal.Approachestomodellingcoupledflowandreactionina
2Dcementationexperiment[J].AdvancesinWaterResources,2008,31(12):1540 - 1551.
[36] CARMANPC.Fluidflow throughgranularbeds[J].ChemicalEngineeringResearchandDesign,1997,75:
S32 - S48.
[37] 姜媛媛,索慧敏,伍小玉.长河坝深厚覆盖层防渗布置分析[J].水电站设计,2014,30(2):86 - 88.
[38] 中华人民共和国水利部.碾压式土石坝设计规范:SL274—2020[S].北京:中国水利水电出版社,2020.
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
(责任编辑:韩 昆)
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