简介：Applyingstiffnessmigrationmethod,a3Dfiniteelementmechanicalmodelisestablishedtosimulatetheexcavationandadvanceprocesses.Byusing3Dnonlinearfiniteelementmethod,thetunnelboringmachine(TBM)excavationprocessisdynamicallysimulatedtoanalyzethestressandstrainfieldstatusofsurroundingrockandsegment.Themaximumtensilestressofsegmentringcausedbytunnelconstructionmainlyliesinarchbottomandpresentszonaldistribution.Thestressincreasesslightlyandlimitedlyinthecourseofexcavation.Themaximumandminimumdisplacementsofsegment,manifestingaszonaldistribution,distributeinarchbottomandvaultrespectively.ThedisplacementsslightlyincreasewiththeadvanceofTBMandgraduallytendtostability.