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:1672643X(2022)04020208
Seepage-stresscoupledsimulationofshieldtunnellingoftheHanjiangtoWeihe
RiverValleyWaterDiversionProjectPhase Ⅱ underhighgroundwaterlevel
2
1
2
2
1
2
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
withtheburieddepthof282.22minBailuyuantunnelwasselectedforthe3Dsimulationofshieldtun
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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