隧道围岩在开挖应力下的弹塑性损伤演化机理研究

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1、重庆交通大学硕士学位论文隧道围岩在开挖应力下的弹塑性损伤演化机理研究姓名：何凯波申请学位级别：硕士专业：港口、海岸与近海工程指导教师：赵明阶20090401ABSTRACTThispaperisbasedonMinistryofTransportationandCommunicationsTechnologyProject”Forecastingtheoryandwarmingsystemsonrelaxationloadofhighwaytunnel”(200631874024)，holdin

2、gthemainlineabouttheelastoplasticdamageofsurroundingrockets，By‰waysofnumericalsimulationtostudytheelastoplasticdamagewithtunnelexcavationintheprocess，throughstudyonotheraspects，suchas：thedeformationofthetunnel，stressdistributionandplasticzoneofthesco

3、pe．sizeect，toanalysetheelastoplasticdamageofthetunnelinexcavationattheuninstallprocess，andlistmedisciplineinthewholeprocess．Themainingstudyreadsasfollows：(1)CombineDamageMechanicsandseveraldamagedetectionmethodsforthetunnel，introducingtheapplicationo

4、nthedamagetheoryintherock．1ikematerials(includingrocktunnel)，expoundingtheresearchstatusofthedamagevariable．aswellasthedefinitionofdamagevariableofthetunnel．(2)Comparethefailuremechanismtherockwiththesurroundingrocketsofloadingandunloadingdamageinthe

5、processingofexcavation，confirmingthemajorresearchobject，whichistheelastoplasticdamageinwithingExcavationunloading；simultaneously,inaccordancewiththetunnelundertherockdamagemechanicstheoryandexperienceofexistingunloadingstatus，combinedwithenergydissip

6、ationtheory,analysingtheelastoplasticdamageconstitutivemodelwhichtheenergydissipationisconsided，then，getthereviseddamageevolutionequation．(3)Usingfiniteelementanalysissoftware．ANSYS10．0．toanalyseclassIItoIVsurroudingrockets，also，withingthehelpofBPArt

7、ificialNeuralNetwork，Optimizethepost。excavationdisturbancezoneandthemechanicalparametersofrockboltingoptimizationparameterscomposity．simulatetheunloadingprocessoftunnelexcavationpractically,througmanalysingsomeaspects，suchas：surroundingrocketsdisplac

8、ement，stress，strainandplasticdamage，obtainedtheelastic．plasticdamageevolutionlawintheprocessofexcavationtunnel．(4)CombinedthefiniteelementanalysisofBiChengTunnelwiththeactualMonitoringdataofBiChengTunnel，theelasto—plasticdamageconstitutivemodelisvali