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ID:33987919
大小:1.53 MB
页数:50页
时间:2019-03-03
《深埋隧洞支护断面形状优化-(5995)》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、万方数据Abs自ractAbstractUndergroundtunnellsareincommonuseinhydropower,transponation,miningandmilitaryundergroundprojects.Thesectionshapeoftunneliscloselyrelatedtothestabilityofthetunnel.AndarationalsetionshapecanimproVethestressstateinmetunnelandmllydeVeloptheself二supportingaLbilit
2、yofsurroundingrock,whichisofhelpf-orthemaintenanceofunder蓼oundengineering.Intheprocessofenginee.ringconstruction,theinsitustressfieldandtheboundaryconditionsofthesurroundingrockmediumarebasicallyunchangedaRermeaxisoftunnelisselected.Whendesigning,thestressdist舶utionofrockandthe
3、stabilitycanbeimproVedonlytoconstantlyadjustthegeometryofcross—sectionthetullllel,whichresultsinasectionshapeoptimizationproblem.Sh:lpeoptimizationofatunnelisanimportantresearchitems,andtherehaVebeenafewstudiesinthepast.HoweVer’mostpreViousdiscussionsareunderthepremiseofbarehol
4、e,thatis,withoutconsideringthesupport,whichwill铲eatlyreducethepracticalsignificanceofstudyingtheshapeoptimizationproblem.Becausewhentheinsitustressisrelativelyla唱e,failureofthesurroundingrockofatunnelevenwiththebestexcavationsectioncan’tbeaVoided.Toprotectstabilityofatunnelflro
5、mthef.ailureofsurroundingrock,supportshouldbeset,sothataradialsupportingforcecanbeproVidedonthesu玎oundingrock.Inthisway’thestressfieldinthesu盯oundingrockchanges,andthetangentialstressalongtheinneredgeoftllnnelcanbereduced.F01.thecertainsizeoftunnelandsupport,theoptimalshapeinth
6、epaperisstudiedundertheoptimizationcriterionthatminimizingthelargesttangentialstressalongtheinneredgeofsupport.Whenfindingtheoptimalsupportshape,twocontactconditionsalongmeinterfacebetweenthe1iningandsurroundingrockmass,i.e.,pureb()ndcontactconditionandpureslipcontactcondition,
7、arediscussedrespect¨ely.Usingtheconfonnalmappingmethodofplaneelasticitycomplex如nction,theoptimizingprocessisactuallytosolVeaseriesoff.onVardprobl锄s.ThngentialstressalongtheinneredgeofsupportisselectedastheobjectiVe如nctionandcoe:陆cientsofthemapping如nctionistakenasdesigIlVariable
8、s.TheminimumValueoftheobjectiVe如nctioniscalculatedbase
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