城市复杂条件下双跨连拱隧道施工力学效应分析-(5572)

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1、万方数据中国铁道科学研究院硕士学位论文Abstractrnleconstructionofcitytunnelandtherationaluseofundergroundspaceareimportantmethodtosolvethegrowingproblemofurbantrafficcongestion，slownessandotherissues．Duetothespeciallocation．citytunnelsareoftensubjecttotheplanningoflanduse，existingbuildingsandotherfactors，whichleadstod

2、ifficultytoconstruct．Undersuchsituation．double．archtunnelwouldbeanidealidea．Double．archtunnelhavemanyadvantages。suchasaconvenientchoiceofentranceandexit，avoidsubIdivisionofbridgeandtunnelline。asmoothline，savingurbanlandsandSOon．However,thespan，depth，processandforceofdouble．archtunnelareverycomplica

3、ted．Thereforetherearemanyunresolvedproblemsinconstructionanddesign．Puttingeffortsonthesafety,efficiencyandreasonabilityofbmldingdouble．archcityBlnnelisnecessary．Thepurposeofthisparristodoresearchonthekeyissuesabouttheconstructionmethods，designtheories，numericalsimulation，fieldmeasurementsandotheras

4、pectsoftullnelconstructionbysmdyingashallowdouble．archmountaintunnelinonecity,andassametimecombiningsomerelatedresearchathomeandabroad．111econclusionhasbeendrawnasfolllows：(1)Citydouble．archtunnelsareoftenhavesomefactors，suchasburieddeeply,largespan，highwaterlevels，complexforcestructureanddifficult

5、construction．Italsoneedanoverallconsiderationofgeologicalconditions，environment,constructiontechnology,duration．andeconomicfactors．MakingacorrectchoiceofallthosefactorsiSveryimportanttotheconstruction．(2)Usingofload-structuremodeltocalculatesurroundingrockpressureisagoodwaytoseetheheightofcollapse-

6、arch，whichisoftenbetweenthewholespanandhalfspan．Protodyakonov’StheoryCanbeusedtocalculatethisheight，whiletheadditionalloadisdistributedonthewholespan．(3)Undercircumstancesofshallow．buriedtunnel，using，nlethreepilotdriftmethodismoreeffectivetocontrolthesubsidenceandthestressofthemid．boardthanusingthe

7、middlepilotdriftmethod．Ifexcavatedfromlefthalftorighthalfcavern，theleftpartWOuldbeaffectedmoregreatly．(4)Intheprocessofdouble．archtunnelexcavation，themid．partitionwillbebentinalldirections．Backflllingbothsi