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1、Influenceofundergroundwaterseepageflowonsurroundingrockdeformationofmulti-archtunnel3DAbstract:Basedonatypicalmulti-archtunnelinafreeway,thefastLagrangiananalysisofcontinuain3dimensions(FLAC)wasusedtocalculatethesurroundingrockdeformationofthetunnelunderwhichtheeffectofundergr

2、oundwaterseepageflowwastakenintoaccountornot.Thedistributionofdisplacementfieldaroundthemulti-archtunnel,whichisinfluencedbytheseepagefield,wasgained.Theresultindicatesthatthesettlementvaluesofthevaultderivedfromcouplinganalysisarebiggerwhenconsideringtheseepagefloweffectthant

3、hatnotconsidering.Throughthecontrastofarchsubsidencequantitiescalculatedbytwokindsofcomputationsituations,andthecomparisonbetweenthecalculatedandmeasuredvalueoftunnelvaultsettlement,itisfoundthatthecalculatedvalue(5.7−6.0mm)derivedfromconsideringtheseepageeffectismoreclosetoth

4、emeasuredvalue(5.8−6.8mm).Therefore,itisquitenecessarytoconsidertheseepagefloweffectoftheundergroundwaterinaquiferousstratumformulti-archtunneldesign.keywords:multi-archtunnel;undergroundwaterseepageflow;couplingflowandstress;surroundingrockdeformation;vaultsettlement1Introduc

5、tionWithhighspeeddevelopmentofournational[1−3]4][5]economy,thehighwayisconstructedonlarge-scaleallaroundthecountry.AlongthefreewayfromChangshatoChongqing(onesectionofwhichisfromChangdetoJishou),manytunnelshavetobeconstructed.Asthesetunnels’stopographyandgeomorphicconditionsare

6、verycomplexandtherainisveryrich,theinvasionofundergroundwaterandsurfacewaterisadifficultprobleminthetunnelconstructionanditsfuturefunction.Inthepastrailwayandhighwaytunnelconstruction,someeffectivewaterproofconstructiontechnologieswereproposed.Buttheresearchesonthemechanismofc

7、ouplingfunctionoffluidandstressanditsinfluenceontunnelsarenotenough.Forexample,LIUandCHENcalculatedandanalyzedthedouble-archtunnelstructureinwater-erodedgroovebutdidnotconsidertheundergroundwaterseepageforce.YANGetalstudiedtheearthquakeresponseoflargespananddouble-archshallowt

8、unnel,combiningwithdynamicstressbutwithoutundergroundwatersee