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1、萬(wàn)方數(shù)據(jù)西南交通大學(xué)碩士學(xué)位論文第1I頁(yè)AbstractCurrently,theamountofgastunnelthroughthecoalformationinsouthwestChinaisgraduallyincreasing,andmostlylargesectiontunnelsaretwo-lanehigh—speedpassengerrail,whichgreatlyimprovedthedifficultyofconstruction.Buttheclassifiedmethodofgastunnelfr
2、om((Technicalcodeforrailwaytunnel塒tllgas))(TB10120-2002)isrelativelysimple,whichignoredthefactorsofsectionsize.Thepredictiontechniquesofcoalandgasejectionmostlylearnedfromthecoalindustry,thesetechnologiesaretime—consuming,andtheaccuracyofthemeasuredindicatorsisnoth
3、igh.Inviewofthis,thestudyofclassificationandcoalandgasoutburstpredictiontechnologyfortunnel、析ttlgasisverynecessary.Onthebasisofdomesticandinternationalresearch,themainresearchofthispaperandtheresultstakenasfollows:(1)Onthebasisofdomesticandinternationalresearchandt
4、heconstructionexperiencefortunnelwithgas,anewgasTunnelclassificationispresentedinthispaperbyanalyzingthemainfactorsofgasconcen仃ation,tunnelventilation,tunnelsectionareaandothermainfactors,、whichsuitableforavarietyofcommontunnel謝tIlgas.(2)Thegradeofrailwaygastunneli
5、sdeterminedbythehighestlevelofworkareaintunnel.ForclassIsection(40-80mz),theboundaryvalueis0.1m’/minbetweenmicroandlowgasworkareaintunnel,andtheboundaryvalueis0.7m’/minbetweenlowandhighgasworkareaintunnel;forclassIIsection(80-120m2),theboundaryvalueare0.3m’/minand1
6、.4m3/minrespectively;forclass11Isection(120-160m2),theboundaryvalueare0.5m3/minand2.1m3/minrespectively;forclassIVsection(>_160m2)'theboundaryvalueare0.7m3/minand2.8m’/minrespectively;Theworkareaingastunnelisjudgedascoalandgasejectionworkareaaslongashereisaejection
7、dangerinthearea.(3)Accordingtothestudyonthemechanismofcoalandgasejection,sixkeyfactorssuchasgaspressure,geologicalstructure,coalstructuretype,coalmassstrength,initialspeedofmethanediffusionandverticaldepthwereselectedasthejudgingindexesofcoalandgasejection.ThentheB
8、Pneuralnetworkmodelforthepredictionofcoalandgasejectionisestablished,whichinvolves6inputnodes,11hiddennodesandtwooutputnodes.25setsoftypicalcoald