Page 187 - 《水资源与水工程学报》2023年第5期
P. 187
! 34 " ! 5 # & ' ( ) & * + , - Vol.34No.5
2023 $ 10 % JournalofWaterResources&WaterEngineering Oct.,2023
DOI:10.11705/j.issn.1672-643X.2023.05.21
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EFGHI:TV554;TV314 JK7LM:A JNOI:1672643X(2023)05018307
Deformationstabilityofhydraulictunnelsunderhighexternal
waterpressureconsideringrockcompressibilityeffect
2
3
2
2
1
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LIUJie,CHENKejin,SUNMeng,LIYunjiao,JIANGLei,XULei
(1.ChongqingWaterConservancyandElectricPowerConstructionSurvey,DesignandResearchInstituteCo.,Ltd.,Chongqing
400020,China;2.CollegeofWaterConservancyandHydropowerEngineering,HohaiUniversity,Nanjing210024,China;
3.JiangsuProvinceGeneralIrrigationCanalManagementBureau,Huaian223200,China)
Abstract:Deepburiedhydraulictunnelsareusuallyconstructedundertheconditionofhighgroundwater
level.Toaccuratelyevaluatethedeformationstabilityofthesurroundingrock,itisnecessarytoreasona
blysimulatethemechanicaleffectofexternalwaterinfiltration.Althoughithasbeenrecognizedthatrock
matrixcompressibilityshouldbetakenintoaccountintheseepage-stresscouplinganalysisofsaturated
rocks ,thereisstilllackofrelevantresearchontheeffectsofrockmatrixcompressibilityonthedeforma
tionstabilityofhydraulictunnelsunderhighexternalwaterpressure.Basedontheeffectivestressprinci
pleofsaturatedporousmediumandporepressurecorrectioncoefficient,aseepage-stresscouplingmod
elofhydraulictunnelsunderhighexternalwaterpressureisproposedwiththeconsiderationoftheperme
abilityvariationofsurroundingrockduringitsdeformationprocess.Then,theproposedmodelisimple
mentedinABAQUS ,andtheseepagefieldanddeformationstabilityofadeepburieddiversiontunnelis
studiedunderdifferentconditionsofrockmatrixcompressibility.Numericalsimulationresultsshowthat
rockmatrixcompressibilitydirectlyaffectstheexternalwaterinfiltrationprocess,anditisunfavorableto
thedeformationstabilityofthehydraulictunnelunderhighexternalwaterpressure.Thegreaterthecom
pressibilityoftherockmatrix ,thelargerthedeformationandplasticzoneofthesurroundingrock.This
indicatesthatthedeformationstabilityevaluationofsurroundingrockofthehydraulictunnelunderhigh
externalwaterpressurewithoutconsideringtherockmatrixcompressibilitywillleadtoincorrectresults
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