浅埋暗挖地铁隧道开挖过程的模拟研究10

236Vol.23No.6200212RockandSoilMechanicsDec.20021999-12-21196510007598(2002)060828031.0500432.4300713.100083U459.2TB115ASimulationstudyofexcavationprocessofshallowembeddedtunnelformetroJIXiao-ming1,2,3ZHANGXuan-bing2BAIShi-wei2(1.ShijiazhuangRailwayInstitute,Shijiazhuang050043,China;2.InstituteofRockandSoilMechanics,TheChineseAcademyofSciences,Wuhan430071,China3.BeijingCampus,ChiinaUnciversityofMiningandTechnology,Beijing100083,China)Abstract:Basedonbasicconceptsofstressreliefanddisplacementreliefintunnelexcavationprocess,aFEMsimulationcalculationforunloadingundertunnelexcavationiscarriedout.Theeffectsoftunnelexcavationmodesonthedisplacementreliefofstrataarediscussed.Thecalculationresultsmaybeusedasareferenceforselectingtunnelconstructionmethods.Keywords:tunnelexcavationdisplacementrelieffiniteelementcalculation13Fig.1Processofexcavation6ss0sbs}{}{}{b0ssss+=0s0sssa-=PXUPXtUPXP),,(),,(),,(∞=XPUtXPUtXPSFFSpNVfNVNFiiiSNEiVNEiVdddTT10T1∫∑∫∑∫+-===sNEN0sfpVNVNFNEiVNEiViiddT10T1gs∑∫∑∫==-=gjjsksDk∑-=+=110jkkjsDssjVNVNFNEiVjNEiViiddT1T1gs∑∫∑∫==-=6010m26.01m13.5m,l=0.432m1/25063.52m34733684y,-12Fig.2Figureofdepthandsizeoftunnel3Fig.3Thefiniteelementmodel82920021-Table1ParametersofDuncan-Changmodelforfinesandysoilc/MPaf/()fRknKbm0.0144.420.613215.70.53151.10.1214-24.9%4Fig.4Thecomparisonbetweentwosettlementsofdifferentexcavationmodes[1],,.[J].,1996,16(2):712.[2],.[J].,1994,15(4):2033.[3],,.[J].,1996,17(4):1722.[4],.[J].,1996,15(3):2033.[5]OuCY,ChiouDC,WuTS.Three-dimensionfiniteelementanalysisofdeepexcavation[J].JournalofGeotechnicalEngineering,1996,122(5):337345.[6]SakuralS.Lessonslearnedfromfieldmeasurementsintunneling[J].TunnellingandUndergroundSpaceTechnology,1997,12(4):453460.827[1].[M],1993.[2].[J].200123(2)157161.[3].[J].1998(3)712.[4].[M].1987.[5].[J],2000(8)()9496.830