隧道火災后襯砌結構力學特性與損傷機理研究.pdf

1、長沙鐵道學院博士學位論文隧道火災后襯砌結構力學特性與損傷機理研究姓名：彭立敏申請學位級別：博士專業(yè)：橋梁與隧道工程指導教師：劉寶琛2000.4.1長沙鐵道學院博士學位論文ABSTRACTAimedatexitingproblemsinresearchoffireaccidentinrailwaytunneIatpresentinChina，inthispaper，followingcontentshavebeendeeplystudie

2、d：1Adoptingtheexperimentalmeansofreallyburningdownforconcretematerialandpartsoftunnelliningunderdifferentfiretemperatureanddifferentablatingtime，thevarietyregulationofmechanicsbehavioranddamagedegreeofliningstructureafte

3、rwithstandinghightemperatureisanalyzed，andtheempiricalcurvesarealsoobtainedThen，thedamageclassificationandenduring—firecriticaltimesofthetunnelliningcausedbyfireaccidentarediscussed2Therelationbetweenremainsstrengthandul

4、trasonicvelocitywhichtunnelliningwasdamageduotohighfiretemperature，aswellasapplicabilityandreliabilityoftheultrasonicdetectivetechnologyusedforthetunnelfiredamageisanalyzedAccordingtochangeofultrasonicvelocity，thedepthca

5、lculatingmethodoffiredamageofliningstructureisalsopresented3Onthebasisofelectronscanningmicroscopeobservationforliningmaterialbeforeandafterbeingburntdown，thechangeregulationofmicrostrucmreofttlnnelliningconcreteeffected

6、hi曲temperatureisanalyzed，anddamagemechanismofliningstructureunderdifferentfiretemperatureisdiscussed4Appliedtoajudgingtheorycoupledeffectiveofmultifactorinfilzzymathematics，thedegreedamagedofliningstructureundersomediffe

7、rentburningtemperaturescaleanddifferentburningtimeissyntheticallyassessedThen，Aformulapredictingdamagegradeofliningbyfiretemperatureispresented5Introducedthecalculatingmodelofreliabilityofcompostingparallelseriescormecti

8、onsystem，areliabilityevaluatingmethodofbearingcapacityofliningstructureafterfireaccidentisstudiedBasedonanalyzingprobabilisticdistributionfortestdatathefailureprobabilityandreliabilityofliningpartsandstructureunderdiffer

9、entfiretemperatureareevaluatedThen，thereliabilityindexofappraisinglinjngstructureafteratunnelfireiSputforwardandtwohistorycasesareappliednleresearchresultsandcorrelatingconclusionsCanbeusedasthefoundationdrawingprocedure

10、thatdamagedegreeofliningstructureisassessedandmaintainingtechniqueisselectedbyrailwayengineeringdivisionaftertunnelfireaccidentKeywordsTunnelfireaccident；Liningstructure；Burningtest；Concretematerialandparts；Damagedegree；