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Bearingmechanism andperformanceoptimizationofDetachedSteel - Tube
Linerforwaterconveyancetunnelacrossurbanarea
1
1,2,3
1
1
SUKai ,TAOJun,XUZhendong,WANGBoshi,ZHUHongze 1
(1.StateKeyLaboratoryofWaterResourceandHydropowerEngineeringScience,WuhanUniversity,Wuhan 430072,China;
2.KeyLaboratoryofRockMechanicsinHydraulicStructuralEngineering,MinistryofEducation,
WuhanUniversity,Wuhan 430072,China;
3.HubeiKeyLaboratoryofWaterSystemScienceforSpongeCityConstruction,WuhanUniversity,Wuhan 430072,China)
Abstract:Inrecentyears,anewtypeofDetachedSteel - tubeLinerhasbeenadoptedintheconstructionofdiversion
tunnelacrossurbanareainChina ,butitsdesignconceptandbearingmechanismisnotclear.Athree - dimensionalfi
niteelementmodelfortheTBMwaterconveyancetunnelacrossurbanareaisdevelopedafterawaterresourcesallocation
project.Thedeformationcharacteristic,stressdistributionandbearingratioofDetachedSteel - tubeLinerareanalyzed.
Theresultsshowthattheradialdeformationofsteellinerandself - compactedconcreteiscoordinatedunderthedesign
internalpressure.Theradialdeformationofsteellinerandself - compactedconcreteisobviouslylargerthanthatofthe
segmentswithinthelayingrangeofplasticdrainageplatewhiletheradialdeformationofsteelliner ,self - compacted
concreteandsegmentsremainscoordinatedoutsidethelayingrangeofplasticdrainageplate.Thestresslevelofsteellin
erislowandthedistributionisveryunevenwhilethestressofsegmentsexceedsthelimitofcrackcontrol.Theinternal
waterpressureismainlybornebysurroundingrock,andthebearingratioofsteellinerisobviouslylowerthanexpected;
boththereductionofthefrictioncoefficientbetweensteellinerandself - compactedconcrete,self - compactedconcrete
andsegmentscanimprovetheuniformityofstressdistributionofsteelliner ,whichcangivefullplaytotheperformance
ofsteelliner,anditisalsoofgreatsignificancetothecrackcontrolofsegments;thebearingratioofsteellinerin
creaseswhend?E(theratioofthicknessofplasticdrainageplatetoitscomprehensiveelasticmodulus)islarger.To
meetthedesignconceptthattheinternalpressureismainlysharedbysteelliner ,d?Eshouldbecontrolledat12.4 -
3
45.1mm ?Nwiththeallowablestressofsteellinerandcrackcontroldesignofsegmentsconsidered.
Keywords:waterconveyancetunnelacrossurbanarea; detachedsteel - tubeliner; drainageplate; bearing
mechanism ;bearingratio
(责任编辑:韩 昆)
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