Page 176 - 《水资源与水工程学报》2024年第5期
P. 176

!35 "!5 #                         & ' ( ) & * + , -                               Vol.35No.5
               2024 $ 10 %              JournalofWaterResources&WaterEngineering                 Oct.,2024

            DOI:10.11705/j.issn.1672-643X.2024.05.21


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               MNFOP:TV312   QRSTU:A    QVWP:1672643X(2024)05017209

                Responsecharacteristicsoftailingsdam undernearfaultgroundmotions

                                         QUXueyang,SONGZhiqiang,LIChuang
             (StateKeyLaboratoryofEcohydraulicsinNorthwestAridRegionofChina,Xi’anUniversityofTechnology,Xi’an710048,China)
               Abstract:Longperioddisplacementpulseandvelocitypulsewithlargevalueareoftenfoundinnearfault
               pulselikegroundmotions ,andtheshorttimepulseenergyconcentrationtheybringforthismorelikelyto
               causetheliquefactionofslagintailingsdams.TakingatailingsdamprojectinInnerMongoliaAutonomous
               Regionasanexample ,atwodimensionalfiniteelementmodelisestablishedtoanalyzethedynamicre
               sponsecharacteristicsofthetailingsdam ,includingliquefaction,permanentdeformation,accelerationand
               damslopestability,bymeansoftheeffectivestressmethodofdeformation-porepressurecoupling.Inad
               dition ,thepulseeffectofnearfaultgroundmotionsandtheinfluencelawofdeformation-porepressure
               couplingontheisodynamicresponseoftailingsdamliquefactionareinvestigatedbythecomparisonwiththe
               totalstressmethod.Theresultsshowthattheporepressureofthedambodyincreasessharplyinashortpe
               riodoftimeundertheactionofpulselikegroundmotions ,andliquefactionismorelikelytooccur;whereas
               thatundernonpulselikegroundmotionsrisesslowlythroughoutthefirsthalfoftheseismicprocess.The
               velocitypulseeffectofpulselikegroundmotionsexacerbatesthefailureofthewhiledamstructure.Com
               paredwiththetimehistoryofthesafetyfactorofdamslopestabilityundernonpulselikegroundmotions ,
               whichexperiencessmallfluctuationsofhighfrequency,thatunderpulselikegroundmotionsundergoes
               largefluctuationsoflowfrequency ,withpoorslopestabilityofthetailingsdam.
               Keywords:nearfaultgroundmotion;tailingsdam;deformation-porepressurecoupling;liquefaction;
               permanentdeformation;damslopestability
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