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472(331)20104Vol.47,No.2,Total.No.331Apr.2010MODERNTUNNELLINGTECHNOLOGY(,250002),、,,。,。:U455.43;U459.5:A:1009-6582(2010)02-0068-05:2009-12-01:(1982-),,,,E-mail:happyxht@163.com.1,,,。,,,,;,,、,。,,。2φ14.93m,K5+988~K6+104,。,,K6+073.110.97m,0.73;K6+096.2,。7-1、8、8-1,4、6、7-1(1)。R=2500m,,;,,,、。4.5%,4.5%,。~,,,,。33.1、,,,;,68472(331)20104Vol.47,No.2,Total.No.331Apr.2010MODERNTUNNELLINGTECHNOLOGY,,,;,,。3.20.7D1D(D),,,,,,。3.3,,、,,。,,,;,,。,11~12m,21m,。,,“、、、、、”,。44.1K6+96.2(1,3)30°,,:3,3。:P=(Pa+P0)/2+0.2:P=(Pa+P0)/2+PPa———;P0———;P———0.0035MPa。,。,±0.01MPa。,1。(1),1Fig.1Geologicconditionofsupershallowcoveredsection69472(331)20104Vol.47,No.2,Total.No.331Apr.2010MODERNTUNNELLINGTECHNOLOGY,,,,、。,:①、,。②,、;,、,,,,,。③20H800Pa,,0~6mm;,。④,,。⑤、、;,。,。,,,,,,。(2),、,、,,。1.96g/cm3,18~22cm;150%~200%,。,,95%~105%(±0.01MPa,)。,1.30~1.40t/m3,1.72t/m3。,Q=1731m3/h,,、1900m3/h、2150m3/h。(1),,,,1.23~1.26g/cm3,1.30~1.40g/cm3。(2),,,23~25s,10m3/h,5%。,,,80~100m3,。(3),,。,,74μm45μm,,。,,15%~25%。1Table1Tunnellingparametersofshallowcoveredsection/(r/min)/(mm/min)/(mm/)K5+988~K6+1040.65~0.825~3035~45⑦-1、⑧⑧-170472(331)20104Vol.47,No.2,Total.No.331Apr.2010MODERNTUNNELLINGTECHNOLOGY(4),,0.9MPa。2。,,,3000m3,25s,2Table2Slurryparametersofshallowcoveredsection/(g/cm3)/(m3/h)/(g/cm3)/(m3/h)/(m3/h)1.23~1.261800~20001.30~1.402050~22505%101.23~1.26g/cm3。8、10,、。,110~130m3。,20min80m3,,30~50m3。,。=××;=(××)×,,。97%~100%,,,。,,,-30~+10mm;,+10~+30mm。,。:(),,,。、,,,,,,、,、、,。,,。,。,,,。,,,。,,。4.2(1),。,,。、。,,5∶3∶2;,(2m)26~30m3。(2)71472(331)20104Vol.47,No.2,Total.No.331Apr.2010MODERNTUNNELLINGTECHNOLOGY,,。,,。,,、。(3),,。13~15m3/m、0.5m3/min,,30mm/min。,,,。(4),,,。20mm,。,,。(5),,。,,,。,,。,,,。,。5(1);,。,、,,。(2)。,“、、”,。(3)。、、、、、,。2009413722,,、,±10mm、±20mm(3),。3Table3Displacementsofcrownsegmentonshallowcoveredsection1239(K6+084)1240(K6+086)1248(K6+102)1249(K6+104)/mm/mm/mm/mm/mm/mm/mm/mm/mm/mm/mm/mm4-100.000.000.000.000.000.004-11-1.000.0011.004.004.0012.000.000.000.000.000.000.004-120.000.000.00-4.001.002.00-1.008.000.000.002.000.004-130.000.000.00-2.00-2.000.004.00-9.001.003.00-1.000.00,29m170m。、,,。72472(331)20104Vol.47,No.2,Total.No.331Apr.2010MODERNTUNNELLINGTECHNOLOGYReferences[1],,.[J].,2009,(3):347~351,366JiaHang,DuChuangdong,WangWenjie.Large-diameterSlurryShieldBoringTechnologyinWater-richSoftGroundwithShal-lowCover[J].TunnelConstruction,2009,(3):347~351,366[2].[J].,2004,41(6):51~56ShenZhengnan.AnalysisandControloftheUpwardMovingofTunnelSegmentsintheProcessofShieldExcavation[J].ModernTunnellingTechnology,2004,41(6):51~56[3],,.[J].,2007,(9):216~219WangChengbing,LiuFengjun,LiaoShaoming,etcal.AnalysisofTunnelStabilityofLargeSlurryShieldTunneledinShallowCovering[J].Highway,2007,(9):216~219[4],,.[J].,2004,23(5):857~861ZhangQinghe,WangShentang,YanChangzheng,etcal.TunnellingMethodsthroughRiver(Lake,Sea)BedunderShallowCover-ingbyShield[J].ChineseJournalofRockMechanicsandEngineering,2004,23(5):857~861[5],.[J].,2006,(4):21~24WangYang,WangWenzheng.DifficultyandCountermeasurethroughRiverBedunderShallowCoveringbySlurryBalanceShield[J].GuangzhouArchtecture,2006,(4):21~24[6],.[C].--2007,2007:251~255XieBin,ShangTaoping.ResearchandApplicationofSynchornisedInjectionSlurryonboardaSuperLargeDiameterSlurryShield[C].RiskPreventionTechnologyofUndergroundProject--Symposiumofthe3rdInternationalTunnellingEngineeringWorkshopinShanghaiin2007,2007:251~255[7].[J].,2003,40(1):26~30ZouChong.SimultaneousGroutingTechniqueforShield-drivenTunnels[J].ModernTunnellingTechnology,2003,40(1):26~30TechniquesforaSlurryShieldUnder-passingtheSectionwithSuperShallowCoverinNanjingYangtzeRiverTunnelXingHuitang(ChinaRailway14thBureauGroup,Co.,Ltd.,Jinan250002)AbstractAccordingtotheengineeringgeologyofthesectionwithsupershallowcoverinNanjingYangtzeRiverTunnel,therisksofshieldtunnelingwereanalyzed.Basedonthecalculationofslurrypressureandslurryparam-eters,arigorousconstructionschemehasbeendrawnuptostrengthentheinformation-orientedmanagementdur-ingtheconstructionandtoensurethesaftyofrapidlyunder-passingthesectionwithsupershallowcover.Thetechniquesuccessfullyadoptedhereinnotonlyhasaccumulatedvaluableexperienceinthefieldofundergroundengineering,butalsohasfilledintheconstructiongapinChinaforlargeslurryshieldsafelyunder-passingsupershallowcoveredsectioninsiltysandstrata.KeywordsSlurryshield;Supershallowcover;Slurrypressure;Slurryparameter;Segmentfloating73
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