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1、、。l053d84分女{:Tu47(I§‰——單位代碼:—業(yè)塹旦學(xué)號(hào)旦型竺竺侖肥工學(xué)大警HefeiUniversityofTechnology碩士學(xué)位論文∥霹、U論文題目:CFG樁復(fù)合地基承載性狀的研究學(xué)位類別:蘭里里主學(xué)科專業(yè):(工程領(lǐng)域)童圭三堡作者姓名導(dǎo)師姓名完成時(shí)間鄔雷勇楊成斌教授2007年5月CFG樁復(fù)合地基承載性狀的研究摘要近十幾年來(lái),復(fù)合地基在我國(guó)的應(yīng)用發(fā)展迅速,各種復(fù)合地基處理方法紛紛出現(xiàn),CFG樁復(fù)合地基因其具有適用范圍廣,承載力提高幅度大、可調(diào)性強(qiáng),工后沉降小,施工質(zhì)量容易保證、經(jīng)濟(jì)效益好等工程特
2、點(diǎn),在工程中被廣泛應(yīng)用。本文回顧了CFG樁復(fù)合地基的研究和發(fā)展現(xiàn)狀,簡(jiǎn)要介紹了復(fù)合地基的形成條件和CFG樁復(fù)合地基的工程特性。并從理論推導(dǎo)和數(shù)值模擬兩方面對(duì)CFG樁復(fù)合地基承載性狀進(jìn)行了研究和探討。主要工作如下:1.分析了CFG樁復(fù)合地基的加固機(jī)理2.分析了樁體復(fù)合地基承載力面積比和應(yīng)力比計(jì)算公式之間的關(guān)系。3.討論了利用《建筑地基處理技術(shù)規(guī)范》(JGJ79--2002)中的公式計(jì)算CFG樁復(fù)合地基承載力特征值一般小于載荷試驗(yàn)值的原因,并結(jié)合實(shí)例加以說(shuō)明。4.對(duì)目前常用的幾種CFG樁復(fù)合地基沉降計(jì)算方法進(jìn)行了介紹,并
3、就這些計(jì)算方法中存在的問(wèn)題進(jìn)行了分析說(shuō)明。5.借助ADlNA有限元分析軟件,對(duì)影響CFG樁復(fù)合地基承載性狀的諸多因素,如荷載水平,褥墊層材料、厚度,樁端土,樁長(zhǎng)和樁身模蘑等進(jìn)行系統(tǒng)的數(shù)值分析研究。關(guān)鍵詞;CFG樁,復(fù)合地基,有限元分析,承載力,沉降,樁土應(yīng)力比StudyontheBehaviorsofCFGcompositefoundationABSTRACTIntherecentseveraldozensyears,compositefoundationusinganddevelopingrapidlyinourc
4、ountry,manykindsofcompositefoundationProcessingmethodsappearsinabundance.BecausetheCFGpilecompositefoundationhastheprojectcharacteristicsoftheapplicablescopeisbroad,theenhancingscopeofbearingcapacitytobebigandtheadjustmentisstrong,subsidenceslightlyafterproject
5、,thequalityofconstructioncanbeguaranteedeasily,theeconomicefficiencyisgoodprojectandsoon.Itisusedinprojectswidely.Thisdissertationhassummarizedtheapplication,developmentandresearchofCFGpilecompositefoundation.Andthroughthetheorydiscussingandnumericalcalculation
6、toresearchtheCFGpilecompositefoundation’sLoadbearingcharacter.ThemainWOrkasfo/lowsshows;1.AnalyzingtheReinforcesthemechanismofCFGpile.2.Analyzedthepilebodycompoundgroundsupportingcapacityareatocomparewiththestressformulabetweentherelations.3.Discussedconstructe
7、dGroundProcessingTechnologystandard)(JGJ79-2。002)inthestandardtocalculatetheCFGpilecompoundgroundsupportingcapacitycharacteristicvaluetobesmallerthantheloadexperimentdefinitecompoundgroundsupportingcapacitycharacteristicvaluereason,andtheunionexampleperformedto
8、show.4.DiscussingtheserviceabilityandgoodandbadpointsoftheCFGpilecompositefoundation’Sseveraltypecalculationmethodsofsubsidence,analyzingthedeviationreasonsinthecalculationo