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复杂深基坑开挖引起邻近既有隧道变形的评价方法研究.docx

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复杂深基坑开挖引起邻近既有隧道变形的评价方法研究 摘要： 本文主要研究复杂深基坑开挖引起邻近既有隧道变形的评价方法，并探讨了影响邻近既有隧道变形的因素。首先介绍了复杂深基坑开挖的概念和现状，分析了邻近既有隧道变形的主要原因，并对基坑开挖对邻近既有隧道变形的影响进行了评价。最后提出具体监测措施，以保证基坑开挖施工安全，并减小对邻近既有隧道的影响。 关键词：基坑开挖，既有隧道，变形评价，监测措施，安全保障。 Introduction Withthedevelopmentofurbaninfrastructureandtheincreasingdemandforlanduse,deepexcavationssuchascomplexdeepfoundationpitshavebecomemorecommonplaceinurbancenters.However,deepexcavationprojectsofteninvolvesignificantrisks,includingpotentialdamagetoexistingstructuresinthesurroundingarea,suchastunnels.Therefore,itisofgreatsignificancetostudytheevaluationmethodsoftunneldeformationcausedbycomplexdeepfoundationpitexcavation,andtoexplorethefactorsthataffecttunneldeformation. ConceptandCurrentSituationofComplexDeepFoundationPitExcavation Complexdeepfoundationpitsrefertoexcavationswithadepthgreaterthan15meters,withahighconstructiondifficultyandshortconstructiontime,suchasundergroundparkinglots,stationsandshoppingmalls.Withtherapiddevelopmentofurbanconstruction,thenumberofcomplexdeepfoundationpitexcavationshasincreasedsharplyinrecentyears,whichhasincreasedtheriskofgeologicaldisastersandhasledtogreaterchallengesforconstructionsafety. FactorsaffectingTunnelDeformation Thedeformationofadjacenttunnelsduringexcavationofcomplexdeepfoundationpitsismainlyrelatedtothefollowingfactors: 1.Thewidthoftheexcavationofthefoundationpit 2.Thedepthofthefoundationpitexcavation 3.Thedistancebetweenthefoundationpitexcavationandthetunnel 4.Thegeologicalconditionsoftheexcavationsite EvaluationoftheInfluenceofComplexDeepFoundationPitExcavationonTunnelDeformation Thedeformationofthetunnelcausedbydeepexcavationofthefoundationpitcanbeevaluatedthroughthefollowingthreemethods: 1.FiniteElementMethod Thefiniteelementmethodisapowerfultoolforanalyzingthedeformationofthetunnelcausedbydeepexcavationofthefoundationpit.Itisbasedonthetheoryofelasticity,plasticity,andviscoelasticity.Themethodhastheadvantageofbeingabletoconsiderthecomplexgeologicalconditionsattheexcavationsiteandcansimulatethedeformationoft