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1、合肥工業(yè)大學(xué)碩士學(xué)位論文剛性樁復(fù)合地基作用機(jī)理及沉降分析姓名:張楊申請學(xué)位級別:碩士專業(yè):巖土工程指導(dǎo)教師:王國體20100301剛性樁復(fù)合地基作用機(jī)理及沉降分析摘要復(fù)合地基能充分利用樁土的共同作用,較好的增強(qiáng)地基的承載能力,在保證工程質(zhì)量的前提下,具有良好的經(jīng)濟(jì)效益,在我國工程建設(shè)中得到了廣泛的應(yīng)用。目前以沉降控制為主的設(shè)計(jì)理念日益突出,而剛性樁復(fù)合地基中樁體強(qiáng)度高,能有效向深層土體傳遞荷載,同時(shí)又能有效降低加固區(qū)的沉降變形量從而降低地基的總沉降量,使得剛性樁復(fù)合地基的應(yīng)用也越來越多。但是剛性樁復(fù)合地基的理論研究與工程實(shí)踐還有較大差距,特別是它的荷載傳遞機(jī)理及沉降變形計(jì)算方法還有待進(jìn)一
2、步研究。本文以帶褥墊層的剛性樁復(fù)合地基作為研究對象,簡要介紹了褥墊層的協(xié)調(diào)機(jī)理、材料選取及墊層厚度;分析了剛性樁復(fù)合地基中樁一土共同作用的荷載傳遞機(jī)理;闡述了剛性樁復(fù)合地基總沉降的組成來源,據(jù)此建立了計(jì)算沉降的有效模型;在本模型的基礎(chǔ)上,通對分別以樁土為參照物來求解復(fù)合地基的沉降;采用Mindlin解對下臥層地基的沉降進(jìn)行了分析。文末通過abaques軟件分析了剛性樁復(fù)合地基工程實(shí)例中樁頂、樁身、樁端及地表的應(yīng)力大小以及樁土應(yīng)力比的大小。關(guān)鍵詞:剛性樁復(fù)合地基樁土應(yīng)力比沉降模型Mindlin解MechanismandSettlementAnalysisofRigidPileComposi
3、teGroundABSTRACTCompositefoundationcouldtakefulladvantageofthepile—soilinteraction,andbettertoenhancethecarryingcasaciiyofthefoundation,ithasgoodeconomicreturnswhenthequalityoftheprojectunderthepremiseandbeenwidelyusedinourprojectconstruction.Currentlysubsidencecontrol—orienteddesignconcestshaveb
4、ecomeincreasinglyprominent.Therigidsileswhichinthecompositefoundationhavehighstrength,caneffectivelytransferloadstodeesersoils,whileeffectivelyreducethereinforcedzone’Ssettlementandthetotalsettlementamountofthefoundation.Forthisreason,theasslicationofrigidpilecompositefoundationisgreatlyincreasin
5、g.Butthereisalargegasbetweenthetheoreticalresearchoftherigidsilecomsositefoundationandengineeringpractice,inparticular,itsmechanismandcalculationofsettlementdeformationremainstobefurtherstudied.Inthispaper,1willtaketherigidpilecompositefoundationwithacushionasaresearchobject.Briefdescristionofthe
6、.theCO-ordinationmechanismofcushion,materialselectionandcushiont.hickness;analysisofrigidpilecompositefoundationpile-soilinteractionoftheloadtransfermechanism;elaboratedofthetotalsettlementsourceofrigidpilecompositefoundation,wherebytheestablishmentofalleffectivemodelforcalculatingthesettlement;B
7、asedonthemodel,toobtainthetotalsettlementbytakingrigidpileandsoilasreferenceobject,andusingMindlinsolutiontosolvethesettlementofsublayer.Atlast,thethesissanalyzesthestresslevelatthepiletop,pileshaft,piletip,foundationb