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1、太原理工大學(xué)碩士研究生學(xué)位論文長(zhǎng)短樁復(fù)合地基應(yīng)力變形特性的數(shù)值分析摘要長(zhǎng)短樁復(fù)合地基作為一種比較新型的復(fù)合地基形式，因其顯著的經(jīng)濟(jì)與社會(huì)效益在工程中得到廣泛的應(yīng)用。但目前其作用機(jī)理、理論研究尚不充分，還需進(jìn)一步探索和研究。長(zhǎng)短樁復(fù)合地基起初多應(yīng)用于建筑工程，隨后逐漸應(yīng)用于路堤等柔性基礎(chǔ)下地基處理中。但柔性基礎(chǔ)下長(zhǎng)短樁復(fù)合地基的應(yīng)力變形特性與剛性基礎(chǔ)下具有明顯差別。剛性基礎(chǔ)下長(zhǎng)短樁復(fù)合地基的理論不能直接運(yùn)用到柔性基礎(chǔ)下復(fù)合地基中。本文以武漢某高層住宅樓的長(zhǎng)短樁復(fù)合地基為依托，基于數(shù)值模擬，對(duì)長(zhǎng)短樁復(fù)合地基變形和承載性狀作
2、了研究。主要內(nèi)容如下：（1）總結(jié)了長(zhǎng)短樁復(fù)合地基的基本理論和研究現(xiàn)狀。（2）基于FLAC3D差分法分析軟件，建立長(zhǎng)短樁復(fù)合地基三維模型，對(duì)其進(jìn)行加載試驗(yàn)。驗(yàn)證了FLAC3D分析長(zhǎng)短樁復(fù)合地基的可行性。得出長(zhǎng)短樁復(fù)合地基的沉降、樁身應(yīng)力、樁土應(yīng)力比隨著荷載增加的變化情況。（3）從褥墊層參數(shù)和樁體參數(shù)兩個(gè)方面進(jìn)行研究，利用數(shù)值模擬分析各參數(shù)對(duì)剛性基礎(chǔ)下長(zhǎng)短樁復(fù)合地基的沉降、樁身應(yīng)力、樁土應(yīng)力比等工程特性的影響。（4）在無(wú)墊層情況下，比較剛性基礎(chǔ)和柔性基礎(chǔ)下復(fù)合地基的基底應(yīng)力分布、沉降、樁身應(yīng)力、樁土應(yīng)力比隨著荷載增加的變化
3、規(guī)律。進(jìn)一步分析褥墊層在剛性基礎(chǔ)和柔性基礎(chǔ)下復(fù)合地基中的不同效用。關(guān)鍵字：長(zhǎng)短樁復(fù)合地基，F(xiàn)LAC3D，數(shù)值分析，工作性狀，基礎(chǔ)剛度，褥墊層I太原理工大學(xué)碩士研究生學(xué)位論文StressandDeformationCharacteristicsofLong-short-pileCompositeFoundationbyNumericalAnalysisABSTRACTThelong-short-pilecompositefoundationasoneofmanynewtypesofcompositefoundationi
4、susedmoreandmoreextensivelyincivilengineeringbecauseofitsremarkableeconomicandsocialbenefits.However,presenttheorystudyonworkmechanismoflong-short-pilecompositefoundationisnotdeeply,sosomemoreresearchesneedtobedone.Thelong-short-pilecompositefoundationismainlyus
5、edinbuildingprojectsatfirst.Afterwardsitisgraduallyappliedtogroundtreatmentforflexiblefoundation,suchasembankment.Butthestressanddeformationcharacteristicsinflexiblefoundationisdifferentfromthatinrigidfoundation.Sothetheoryinrigidfoundationcannotbedirectlyapplie
6、dtoflexiblefoundation.Inthispaper,thestressanddeformationcharacteristicsofthelong-short-pilecompositefoundationwerestudiedrelyingonahigh-riseapartmentbuildinginWuhanbyusingnumericalsimulation.Thefollowingworksaredone:(1)Summarizedthestudypresentstateofthelong-sh
7、ort-pilecompositefoundation.(2)Generatedthree-dimensionalmodeloflong-short-pilecompositefoundationbyFLAC3D,thendoingloadingtest.VerifyfeasibilityofFLAC3Dinstudylong-short-pilecompositefoundation.GetthechangeruleofstressIII太原理工大學(xué)碩士研究生學(xué)位論文distributionunderfoundati
8、on,settlement,axialstressofpileandpile-soilstressratiowiththeincreaseofload.(3)Fromcushionandpiletwoaspects,analyzedeffectsofparametersonthelong-short-pilecompositefo
