Page 185 - 《水资源与水工程学报》2024年第5期
P. 185

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

            DOI:10.11705/j.issn.1672-643X.2024.05.22


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                    Characteristicsofseepage-stresscouplinginmine-shielddocking
                                   sectionofhighspeedrailwaysubseatunnel

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                                        1
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                                                    1
                            JINGYifeng,WANGBo,MEIJie ,LIUJinwei,MENGQingyu                  3
                 (1.KeyLaboratoryofTransportationTunnelEngineering,MinistryofEducation,SouthwestJiaotongUniversity,Chengdu
                   610031,China;2.InstituteofUrbanRailTransportation,SouthwestJiaotongUniversity,Chengdu611756,China;
                                      3.ChinaRailwayDesignCorporation,Tianjin300308,China)
                 Abstract:Underwaterdockingconstructionbymineandshieldmethodisakeytechnicalissueinthe
                 constructionofsubseatunnels ,andunderstandingtheseepage-stresscouplingcharacteristicsisthe
                 premiseofsafeconstructionandoperationofthedockingsectionoftunnels.Thisstudyemployedafinite
                 elementsoftwaretocarryoutthreedimensionalnumericalsimulationofonsitedockingconstruction
                 scheme.Basedonthesimulationresults ,theseepagecharacteristics,displacementdeformationand
                 stresschangerulesofdifferentconstructionsectionsofthetunnelwereanalyzed,whichrevealedtheseep
                 age-stresscouplingmechanism oftheconstructionofthetunnelmine-shielddockingsectiononthe
                 surroundingrockdisturbance.Theresultsshowthataftertunnelexcavation ,theporewaterinthesur
                 roundingrockpoolsandcontinuouslyrechargestothetunnelcaveperimeterandtheexcavationsurface ,
                 resultinginareductionofporewaterpressure,theformationofprecipitationfunnels,anincreaseinthe
                 seepageratearoundthetunnelcaveperimeter ,andalargeamountofwaterinfluxduringtheexcavation
                 stage.Affectedbythehydraulicgradient ,theporewaterpressureatthebottomofthearchisthelargest,
                 butsettingupdrainagemeasurescanleadanddrainthepressureduringconstruction.Duringtunnelex

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