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1、重慶大學(xué)碩士學(xué)位論文軟弱圍巖連拱隧道中隔墻應(yīng)力與變形分析研究姓名:陳曉江申請學(xué)位級別:碩士專業(yè):巖土工程指導(dǎo)教師:劉新榮20050501重慶大學(xué)碩士學(xué)位論文中文摘要摘要近年來,隨著高等級公路建設(shè)的不斷發(fā)展,隧道的數(shù)量日益增多。連拱隧道具有線形流暢,空間利用率高,占地面積較少,與洞外線路連接方便等優(yōu)點(diǎn),得到了越來越多的應(yīng)用。中隔墻作為連拱隧道的核心結(jié)構(gòu),在隧道的施工過程中要經(jīng)歷多次擾動(dòng)和應(yīng)力從分布,具有復(fù)雜的受力形式。目前,專門對中隔墻作的數(shù)值模擬計(jì)算還很少,在已有的實(shí)例中一般是將連拱隧道整體作為主要
2、分析對象,對中隔墻的研究還不夠全面。為了解和掌握連拱隧道中隔墻在隧道施工過程中受力及相應(yīng)應(yīng)力與位移的特點(diǎn),本文以我國首例黃土連拱隧道——離石連拱隧道為實(shí)際背景,應(yīng)用ANSYS有限元程序,建立了三個(gè)二維平面彈塑性有限元模型,通過模擬開挖過程的數(shù)值計(jì)算,得到了不同截面形式和尺寸的中隔墻在不同中墻基礎(chǔ)條件下的應(yīng)力分布規(guī)律和位移情況,對直中墻和曲中墻的受力特點(diǎn)做了比較分析,提出了優(yōu)化中墻尺寸的一些看法。另外本文還建立了三維空間有限元非線性彈塑性模型,通過數(shù)值計(jì)算得到了在施工過程中,中隔墻空間效應(yīng)、左右洞的相
3、互影響,以及墻體結(jié)構(gòu)的應(yīng)力分布規(guī)律及穩(wěn)定性。最后通過分析離石連拱隧道中墻監(jiān)控量測得到的第一手實(shí)測數(shù)據(jù),來驗(yàn)證數(shù)值分析結(jié)果的可靠性。關(guān)鍵詞:連拱隧道,中隔墻,數(shù)值分析,施工模擬,彈塑性分析I重慶大學(xué)碩士學(xué)位論文英文摘要ABSTRACTInthelastfewyears,withthedevelopmentofhighway,thenumberoftunnelshasevidentlyincreased.Bi-archtunnels,whichhavetheadvantageofsmoothlinety
4、pe,higherusefactorofspace,lowerlandoccupancy,andbeenconvenientforthetunnelstoconnectwiththewayoutofthetunnels,havebeenadoptedinthehighwayprojectincreasingly.Themid-partition,asthecorestructureofBi-archtunnel,willcomethroughsomekindofdisturbanceandstres
5、sredistributingintheprocessoftunnel'sconstruction.Atpresent,therearestillfewstudiesofnumericalsimulationspecializedinthemid-partition.Notwithstandingthatsomethesishavestudiedthebi-archtunnel,theydidn’tanalyzedthemid-partitioncomprehensively.Inordertofi
6、ndoutthesituationofmid-partition’sstressanddeformationundereachphaseofthepredeterminedexcavatingtechnique,thepaperusedtheFEMsoftofANSYStoestablishthreeelastoplasticFEM2-DplanmodelsbasedontheLishiBi-archTunnelProject,whichisthefirstconstructedBi-archtun
7、nelinloessstratumofChina.Bythenumericalcalculationofsimulatingthetunnel’sexcavatingprocess,thepapergainsthedistributionlawofmid-partition’stressanddeformationcorrespondingtodifferentsectionfigures,geometricalmeasuresanddiversefoundationperformance.Andt
8、hepaperalsocomparedthemechanicscharacteristicofflectionalmid-partitionwiththeerectmid-partition,thusbroughtforwardtheopinionsabouttheoptimizationtechniquesofthemid-partition’sgeometricalmeasures.Furthermore,thepaperestablishedaperfectno