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1、西南交通大學(xué)碩士學(xué)位論文成都地鐵隧道施工引起的地表沉降研究姓名:劉東申請(qǐng)學(xué)位級(jí)別:碩士專(zhuān)業(yè):巖土工程指導(dǎo)教師:呂和林20090601西南交通大學(xué)碩士研究生學(xué)位論文第1頁(yè)摘要盾構(gòu)法施工作為成都地鐵施工中一種主要的施工方法,其施工過(guò)程中不可避免的會(huì)對(duì)周?chē)鷰r土體產(chǎn)生擾動(dòng),引起的地表沉降可能影響地面建筑物和既有管線(xiàn)設(shè)施,當(dāng)?shù)乇沓两颠_(dá)到一定程度時(shí)將影響地面建筑物的安全和地下管線(xiàn)的正常使用。為了減少由于施工引起的地表沉降對(duì)地面建筑物和地下設(shè)施的損害,有必要對(duì)施工引起地表沉降進(jìn)行研究。本文以成都地鐵一號(hào)線(xiàn)桐梓林站至火車(chē)南站區(qū)間段
2、為背景,采用FLAC3D數(shù)值模擬的手段,對(duì)成都市特有地質(zhì)條件下盾構(gòu)隧道施工引起的地表沉降進(jìn)行研究。重點(diǎn)研究了隧道埋深、盾尾注漿、掘進(jìn)壓力、雙孔隧道中線(xiàn)間距以及雙孔隧道不同開(kāi)挖方案對(duì)地表沉降的影響,并運(yùn)用灰色理論建立灰色模型,對(duì)地表一點(diǎn)不同時(shí)刻的地表沉降值進(jìn)行預(yù)測(cè)。研究表明,在該盾構(gòu)區(qū)間,在相同的開(kāi)挖條件下,地表沉降隨覆土厚度的增加而增大;盾構(gòu)掘進(jìn)壓力的大小對(duì)地表沉降的影響比較大;注漿層彈性模量對(duì)地表沉降影響很大;在相同的開(kāi)挖條件下,中線(xiàn)間距越小,地表沉降越大,當(dāng)中線(xiàn)間距大于16m時(shí),該區(qū)間隧道中線(xiàn)間距的增加對(duì)地表沉
3、降的影響趨于穩(wěn)定;在雙孔盾構(gòu)隧道施工時(shí),左右兩洞同時(shí)掘進(jìn)的方案在控制地表沉降方面比先開(kāi)挖完一線(xiàn)再開(kāi)挖另一線(xiàn)的方案有利;運(yùn)用灰色理論建模對(duì)地表一點(diǎn)不同時(shí)刻的沉降值進(jìn)行預(yù)測(cè)是可行的。關(guān)鍵詞:成都地鐵;盾構(gòu)法施工;地表沉降;數(shù)值模擬;灰色模型西南交通大學(xué)碩士研究生學(xué)位論文第1I頁(yè)AbstractShieldtunnelingisconsideredasoneofthemostimportantmethodsinthetunnelconstructionofChengdu,whichwilldisturbambientro
4、ckmassinevitably,andthegroundsurfacesettlementislikelytoinfluencethebuildingsandtheexistingpipelines.Whenthesettlementgetstosomeextent,itwillaffectthesafetyofbuildingsovergroundandthenormalutilizationofpipelinesunderground.Toreducethedamagestothebuildingsoverg
5、roundandfacilitiesunderground,whichareinducedbytunnelconstruction,itisessentialtostudythegroundsurfacesettlement.ByapplyingFLAC3Dnumericalsimulation,thispapermainlydiscussesthegroundsettlementcausedbyshieldtunnelingintermsoftheparticulargeologicalconditioninCh
6、engdu,whiletakingtheblocksbetweenTongZilinStopandSouthernTrainStationasbackgrotmd.Andinfluencesonthegroundsettlementduetoburieddepthoftunnel,groutingatthetailoftheshield,tunnelingpressure,thedistancebetweendoubletracktunnelsandtWO-lanetunneldifferentshieldexca
7、vationprogramarealsostudied.Besides,theapplicationofGreyTheoryinforecastingthegroundsurfacesettlementofacertainspotindifferentmomentsisintroduced.Theresearchshowsthatunderthesameshieldexcavatingsituation,thegroundsettlementofthisshieldingsectionincreasesasthec
8、overingearththickens;thestrengthoftunnelingpressurebearsrelativelybigimpactsonthegroundsettlement;theelasticmodulusofinjectedlayerinfluencesthegroundsettlementalot;underthesameexca