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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
