Page 206 - 《水资源与水工程学报》2022年第4期
P. 206

!33 " ! 4 #                       & ' ( ) & * + , -                               Vol.33No.4
               2022 $ 8 %               JournalofWaterResources&WaterEngineering                 Aug.,2022

            DOI:10.11705/j.issn.1672-643X.2022.04.27


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                 FGHIJ:TV554 .2;TU457   KLMNO:A    KPQJ:1672643X(2022)04020208
            Seepage-stresscoupledsimulationofshieldtunnellingoftheHanjiangtoWeihe
              RiverValleyWaterDiversionProjectPhase Ⅱ underhighgroundwaterlevel

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               DONGPeng,LIChangchang,WANGZhengzhong,LIUBiao,LIUQuanhong,MAQingrui
                     (1.Hanjiang-to-WeiheRiverValleyWaterDiversionProjectConstructionCo.,Ltd.,Xi’an710024,China;
                   2.CollegeofWaterResourcesandArchitecturalEngineering,NorthwestA&FUniversity,Yangling712100,China)
                 Abstract:BailuyuantunnelisapartoftheHanjiangtoWeiheRiverValleyWaterDiversionProject
                 Phase Ⅱ,whichischaracterizedbyitsdeepestburieddepthandhighestgroundwatertaleintheLoess
                 Plateauarea,thefeasibilityandsafetyofitsshieldtunnellingexcavationarenotclear.Thus,thesection
                 withtheburieddepthof282.22minBailuyuantunnelwasselectedforthe3Dsimulationofshieldtun
                 nelingexcavationusingMohr-Coulombelastoplasticconstitutivemodelandthestiffnessmigrationmeth
                 odwiththeapplicationofABAQUSsoftware.Thevariationofporewaterpressure ,stressdeformation,
                 plasticzoneinsurroundingrockanddisplacementofliningofthetypicalsectionduringtheexcavation
                 phasewereanalyzedemphatically.Theresultsshowthatwiththeprogressoftheexcavation,thepore
                 pressuredecreasedfirstthensteadilyrosetoastablestate.Excessporewaterpressureoccurredatthe
                 sectionwhichwas3.6mawayfromthefrontedgeoftheshieldtunnellingfacebecausethesectionstarted
                 toshrink,anditsmaximumvaluenearlyreached248.0m.Thedeformationofthetunnelinvolvedcon
                 vergencearoundthetunnel ,subsidenceatthecrownandheaveattheinvert.Thestress,strainandra
                 dialdisplacementofthesurroundingrockweresymmetricallydistributed.Sinceequivalentplasticstrain
                 mainlyoccurredwithin3matthespringlineofthetunnelbutnoobviousplasticzoneabovetheinvert,
                 themostlikelyfailuremodewouldbethecollapseofsurroundingrockatthesidesofthetunnel.During
                 theconstructionphase,thedominantstressoftheliningbothattheinnerdiameterandouterdiameterwas

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