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288Vol.28No.820078RockandSoilMechanicsAug.20072005-09-082006-01-16863No.2002AA4200201962E-mail:zhuhehua@tongji.edu.cn10007598(2007)0815870811,211311.2000922.2000933.200233TU411.3AExperimentalstudyonthrustforceduringtunnelexcavationwithearthpressurebalanceshieldmachineZHUHe-hua1,XUQian-wei1,2,LIAOShao-ming1,YUNing1,FUDe-ming3,WUXiang-song11.KeyLaboratoryofNationalRockandSoilEngineering,DepartmentofGeotechnicalEngineering,TongjiUniversity,Shanghai200092,China;2.DepartmentofCivilEngineering,UniversityofShanghaiforScienceandTechnology,Shanghai200093,China;3.ShanghaiResearchInstituteofTunnelConstructionTechnique,Shanghai200233,ChinaAbstract:Thrustforceisanimportantconstructionparameterduringtunnelexcavationwithshieldmachine.Itnotonlydeterminestheadvanceratebutalsoinfluencesotherworkingparameters,suchascuttertorqueandrotationspeed,etc.Butsofar,theresearchonthrustforce,especiallyonfrictionalforcebetweensoilandshieldtube,stilldoesnotgointoenoughdepth.Therefore,aspecialmodeltestschemeontunnelexcavationwithearthpressurebalance(EPB)shieldmachineisdesignedbytheauthors;whilethesiltsandygroundinShanghaiareaistakenasprototype,thendifferentparametersofshieldmachineandgroundpropertiescanbecombinedfortesting.Basedonthetestresults,studiesarecarriedouttodiscoverthevariationlawofthrustforce,themechanismoffrictionbetweensoilandshieldtubeanditsinfluencefactors.Furthermore,acalculationformulaofthrustforceisdeduced.Keywords:modeltest;earthpressurebalanceshieldmachine;thrustforce;frictionalforce1[1]200014.5%18.5%53.5%73%25%31%47.73%1994[3]20071996[4]1994[5]PelletBeaucour2002[6]211Fig.1WorkmechanismofEPBshieldmachine33.122(:mm)Fig.2Sketchmapofmodeltest(unit:mm)3(:mm)Fig.3Sketchofmodelshieldmachine(unit:mm)2.4m1.2m2.4m400mm43158883.21HD30%[7]1Table1ContentsofmodeltestNo.H/D/%1268236834684+2685+23644.14PRpFvPhPPgpPFR=+10πdLFfDl=∫2DfkPaLPRF-PRf4Fig.4Loaddevelopedduringtunnelingoperation4.253123PR3f′f65Fig.5Thrustforceunderdifferentdepthu15892007()tancuτσϕ=+−3τσucϕ6Fig.6Dynamicfrictionstressesunderdifferentdepth4.37123f7Fig.7Thrustforcesunderdifferentcutteropeningrate4.488Fig.8Thrustforcesindifferentsoilmass4.513-faf21PPP∆=πaPfDL∆=′4P∆2P1PDL′afPellet15908Beaucour2002[6]9No.4No.5No.4No.5No.19Fig.9Comparisonofadditionalfrictionstress107.510.0815.92kPa13.03kPa10Fig.10Totalthrustforceatdifferentsections21010cm90cm3PPzPrPrPFRp1111Fig.11Deflectionofshieldmachine5DLγcϕSHNµcSγϕµ2007N[2]-5.112PRRR=+5()211π14RDpξ=−6222π4RDp=7PRkN1RkN2RkNξDm1pkPa()12pKHDγ=+2pkPaHmK5.2F1F2F1FWLµ=8π22π22d2nDFLµσθ−=∫9µWkN/mnσN/m2LnσfπFDLf=10vhπ2PPWfDµ+⎛⎞=+⎜⎟⎝⎠11vPHγ=12()()2h2tan452PHDγϕ=+−D13µµδtanµδ=14δϕ2ϕ3ϕStein[8]19890.30.40.20.3Steinδ617ºNo.412a0.8m1.750g/cm330ϕ=D2/3ϕ500N/m46.51kPaf=6.37kPa12Fig.12Calculationmodeofearthpressure5.3M8FCBφ6.34m10.78917.256m+3.70m3-21Xk12+082.97415928Xk11+961.3727.719.216m3-213Fig.13Actualthrustforcevaluevs.predictedvalue114131440%14Fig.14Theoccupiedproportionoffrictionalforce6123456740%[1],.[J].,2000,(1):2532.[2],,.[J].,2001,27(7):8998.HELian,LIUCan-sheng,SHUAIHua-guo.Studyonthecalculationofthrustforceofpipejacking[J].WaterandDrain,2001,27(7):8998.[3],,.[A].49[C].[s.l.]:[s.n.],1994.[4].[A].•6[R].[s.l.]:[s.n.],1996.[5],,.[A].49[C].[s.l.]:[s.n.],1994.[6]PelletBeaucourAL,KastnerR.Experimentalandanalyticalstudyoffrictionforcesduringmicro-tunnelingoperations[J].TunnellingandUndergroundSpaceTechnology,2002,17:8397.[7]ChungsikYoo,Hyun-KangShin,Deformationbehaviour15932007oftunnelfacereinforcedwithlongitudinalpipeslaboratoryandnumericalinvestigation[J].TunnellingandUndergroundSpaceTechnology,2003,18:303319.[8]SteinD,MollersK,BieleckiR.Microtunneling[M].Berlin:VerlagErnst&Sohn,1989.20074EI41100%1639642264364836496544655658565966266636697670674867567896796831068468811689693126946981369970414705710157117161671772217723727187287321973373720738742217437462274775223-753757247587622576376826SMW76977327774778287797842978578930790794317957983279980233Weibull80380634807811358128163681782237CO2-ECBM82382638DFP8278303983183540836842418438481594