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2510Vol.25No.10200410RockandSoilMechanicsOct.20042003-08-042004-01-081973E-mail:gisyaj@163.net10007598(2004)10163205EPSO357.3AStudyonflowingthroughscrewconveyorduringexcavationwithEPBshieldQINJian-she,ZHUWei(ResearchInstituteofGeotechnicalEngineering,HohaiUniversity,Nanjing210098,China)Abstract:Whenearth-pressurebalance(EPB)shieldisusedinhighpermeabilitygroundaswellashighgroundwaterpressure,groundwaterwillflowsthroughscrewconveyor(Flowwing),thiswillleadthelossofgreatquantityofgroundwaterandeventhehaltofexcavation.Basedonthesteady-flowseepagetheoryandshielddrivingprinciple,amethodforjudgeFlowingisprovided,andamodelforstudytheseepageofgroundwaterinchamberandscrewconveyorisbuilttoexplainthemechanismofFlowing.Withthemodel,theparameterssuchassoilcondition,shieldgeometry,excavationinstructionwhichrelatewithFlowingareanalyzedandtheresultsgivesomeusefulconclusionsandsuggestionstopredictandavoidflowing.Themodelcanalsobeusedtocalculatethedischargeofgroundwater.Keywords:earth-pressurebalance(FPB)shield;flowingthroughscrewconveyor;seepagecalculation1[1]22.1[2.3]11Fig.1SchematicplaneofEPBshielddriving102.22.3[4]2L1L2DdH1H20qk2Fig.2Themodelofgroundwaterseepageflowinsideshieldmachine22)2()dd(DkxhQpΙΙ(1)qpcos)2()dd(2dkxhQΙΙΙΙ(2)Ιhh20,1DHhx+==Ι(3)2sin;cos221dLhLLx+=+=qq(4)H1hhLxΙ=(5)QQQ==ΙΙΙ(6))(4)cos22(222121dLDLLdDHkQ+--+=qp(7)cos,coscoscos)(cos22sin0,)(cos22211212122121221211⎪⎪⎪⎪⎪⎩⎪⎪⎪⎪⎪⎨⎧+++--+++--++=qqqqqqqLLxLxLLLLDdLdDHdLLxxLdDLLdDHDHh(8)⎪⎪⎪⎪⎭⎪⎪⎪⎪⎬⎫--+=+--+=,cos1cos)(cos2;,)(cos21221221211qqqqLDdLdDHkVLdDLLdDHkV(9)(9)n,⎪⎪⎭⎪⎪⎬⎫+==′+==′,)1(;,)1(222111eeVnVVeeVnVV(10)163320042.4(1)V22)(dDVV=″(11)(2)(9)′2V(3)″2V′2V⎪⎪⎭⎪⎪⎬⎫′″′=″′″,,,222222VVVVVV(12)3L1=1mL25mD6md=1mq60o3.120m3m[5]11Table1PermeabilitycoefficientandporosityofdifferentsoiltypeV=2cm/min343Fig.3Thetranslationalvelocityofsoilandgroundwaterinsideshieldmachinewithdifferentsoilconditions4Fig.4DischargesofgroundwaterduringEPBdriving317m0.2cm/s40.005cm/s0.0050.05cm/s0.05cm/s1.5m1m30.5cm/s6m33.20.005cm/s0.552cm/mink/cms-1n1.0×1011.0×1000.201.0×1001.0×10-10.301.0×10-11.0×10-20.351.0×10-21.0×10-40.581.0×10-41.0×10-50.6516341050.05cm/s0.465k=0.005cm/sFig.5Velocityofsoilandgroundwaterinsideshieldmachinewithk=0.005cm/sanddifferentwaterheads6k=0.05cm/sFig.6Velocityofsoilandgroundwaterinsideshieldmachinewithk=0.05cm/sanddifferentwaterheads563.379)(124[6][7,8]nvdRe=(13)d;vuRe10Re10dvv/10=22Re10Table2GroundwaterseepagevelocityindifferentsoilswithRe=10/mmv/cms-1101000.010030.10031100.10031.003010.51.00302.00600.50.252.0064.0120.250.14.01210.030.10.0510.0320.060.050.0120.06100.3?201.003×10-6m2/s12970.51cm/s7Fig.7GroundwaterseepagevelocityinsideshiedmachinewithdifferentwaterheadsRemmAJKQ=10Re100(14)16352004Kmm=1.752A.Chezy21cAJKQ=,Re100(15)Kc5(1)(2)(3)(4),[1],,.[J].().[2],,.[M].:,1999.[3]BernhardMaidl,MartinHerrenknetcht,LotharAnheuser.MechanisedShieldTunnelling[M].Berlin:Ernst&SohnVerlagforArchitekturundtechnische.WissenschaftenGmbH,1996.[4][J]2001,22(4):389—394.LUPei-yan.Assessingtheformulaforseepagespiping[J].RockandSoilMechanics,2001,22(4):389—394.[5],,.[M].:,1994.[6].[J]..2003,(24):159162.CHAIJun-rui.Nonlinearproblemsinrockandsoilmasshrdraulics[J].RockandSoilMechanics,2003,24(1)159162.[7],,.[M].:,1997.[8].[M].:1997.1636
本文标题:土压式盾构施工中地下水出渗机理研究
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