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1、NATMtunneldesignprincipleintheconstructionofmajorandConstructionTechnologyI.TheNATMDesignPrinciple1.TunneldesignandconstructionoftwomajortheoreticalanddevelopmentprocessSincethe20thcentury,humanspaceonthegroundfloorofthegrowingdemand,thustheundergroundworkso
2、fthestudyofarapiddevelopment.Inalargenumberofundergroundengineeringpractice,itisgenerallyrecognizedthatthetunnelandundergroundcavernproject,thecoreoftheproblem,allupintheexcavationandretainingtwokeyprocesses.Howexcavation,itwillbemoreconducivetothestabilitya
3、ndcavernfacilitatesupport:Formoresupport,supportinghowtheycanmoreeffectivelyensurestabilityandfacilitatethecavernexcavation.Thisisthetunnelsandundergroundworkstwopromoteeachotherandcheckeachother'sproblems.Tunnelsandundergroundcaverns,andfocusingonthecoreiss
4、ueswiththeabovepracticeandresearch,indifferentperiods,Peopleofdifferenttheoriesandgraduallyestablishedasystemofdifferenttheories,Eachsystemincludestheoryandresolve(orarestudyingtheresolution)fromtheworksofunderstanding(concept),mechanics,engineeringmeasurest
5、otheconstructionmethods(Technology),aseriesofengineeringproblems.Atheoryofthe20thcenturythe1920sthetraditional"loadrelaxationtheory."Itscorecontentis:astablerockself-stability,noload:unstablerockmayhavecollapsed.needshoringstructuretobesupported.Thus,therole
6、ofthesupportingstructureoftherockloadiswithinacertainrangemaybeduetorelaxationandcollapseofrockgravity.Thisisatraditionaltheory,andtheirrepresentativeisTaishajiandPrincipe'sandothers.Itworkssimilartothesurfaceissuesofthethinkingisstillwidelyusedto.Anotherthe
7、oryofthe20thcenturymadethe1950sthemoderntheoryoftimberingor"rockforthetheory."Itscorecontentis:rockstabilityisclearlybearingrocktotheirownself-stability:unstablerocklossofstabilityisaprocess,andifthisprocessinprovidingthenecessaryhelporrestrictionswillstillb
8、eabletoentertherocksteadystate.ThistheoreticalsystemofrepresentativecharactersLabuxiweici,Miller-Feiqieer,Fenner-DaluoboandKashitenaiothers.Thisisamoremoderntheory,itisalreadyoutofthegroundworks
