深埋隧洞支护断面形状优化

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1、万方数据华北电力大学硕士学位论文万方数据Abs自ractAbstractUndergroundtunnellsareincommonuseinhydropower，transponation，miningandmilitaryundergroundprojects．Thesectionshapeoftunneliscloselyrelatedtothestabilityofthetunnel．AndarationalsetionshapecanimproVethestressstateinmetunnelandmllydeVeloptheself二

2、supportingaLbilityofsurroundingrock，whichisofhelpf-orthemaintenanceofunder蓼oundengineering．Intheprocessofenginee．ringconstruction，theinsitustressfieldandtheboundaryconditionsofthesurroundingrockmediumarebasicallyunchangedaRermeaxisoftunnelisselected．Whendesigning，thestressdist

3、舶utionofrockandthestabilitycanbeimproVedonlytoconstantlyadjustthegeometryofcross—sectionthetullllel，whichresultsinasectionshapeoptimizationproblem．Sh：lpeoptimizationofatunnelisanimportantresearchitems，andtherehaVebeenafewstudiesinthepast．HoweVer’mostpreViousdiscussionsareunder

4、thepremiseofbarehole，thatis，withoutconsideringthesupport，whichwill铲eatlyreducethepracticalsignificanceofstudyingtheshapeoptimizationproblem．Becausewhentheinsitustressisrelativelyla唱e，failureofthesurroundingrockofatunnelevenwiththebestexcavationsectioncan’tbeaVoided．Toprotectst

5、abilityofatunnelflromthef．ailureofsurroundingrock，supportshouldbeset，sothataradialsupportingforcecanbeproVidedonthesu玎oundingrock．Inthisway’thestressfieldinthesu盯oundingrockchanges，andthetangentialstressalongtheinneredgeoftllnnelcanbereduced．F01．thecertainsizeoftunnelandsuppor

6、t，theoptimalshapeinthepaperisstudiedundertheoptimizationcriterionthatminimizingthelargesttangentialstressalongtheinneredgeofsupport．Whenfindingtheoptimalsupportshape，twocontactconditionsalongmeinterfacebetweenthe1iningandsurroundingrockmass，i．e．，pureb()ndcontactconditionandpur

7、eslipcontactcondition，arediscussedrespect¨ely．Usingtheconfonnalmappingmethodofplaneelasticitycomplex如nction，theoptimizingprocessisactuallytosolVeaseriesoff．onVardprobl锄s．ThngentialstressalongtheinneredgeofsupportisselectedastheobjectiVe如nctionandcoe：陆cientsofthemapping如nctioni

8、stakenasdesigIlVariables．TheminimumValueoftheobjectiVe如nction