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1、西南交通大學(xué)碩士學(xué)位論文樁網(wǎng)復(fù)合地基沉降計(jì)算方法研究姓名:王帥申請學(xué)位級別:碩士專業(yè):巖土工程指導(dǎo)教師:馬建林20090501酉宣窯湮太堂亟±班寶生堂僮詮玄簋!亟摘要樁網(wǎng)復(fù)合地基主要有路堤填料、加筋墊層、加固區(qū)和下臥持力層四部分組成,其工作機(jī)理十分復(fù)雜。本文首先分別對四部分的工作形狀進(jìn)行分析,建立各自的力學(xué)模型及其基本微分方程,然后通過平衡方程及邊界條件,將各部分又統(tǒng)一為一個(gè)整體,并組成了整個(gè)聯(lián)立方程組,獲得了樁土各自分擔(dān)荷載、加筋體拉力、樁土沉降、樁身軸力、樁側(cè)摩阻力等的計(jì)算方法。然后,通過京滬高速鐵路現(xiàn)場試驗(yàn),獲得了沉降,樁土各自分擔(dān)荷載等隨填筑荷載及時(shí)間的變化規(guī)律;接
2、著應(yīng)用Plaxis計(jì)算軟件,對試驗(yàn)路段進(jìn)行數(shù)值分析,獲得其沉降、樁土各自分擔(dān)荷載、水平加筋體的應(yīng)力與變形、樁身軸力、樁側(cè)摩阻力等計(jì)算結(jié)果。最后將分析模型、現(xiàn)場試驗(yàn)、數(shù)值分析三者的結(jié)果進(jìn)行了比較分析,驗(yàn)證了本文建立的力學(xué)模型基本能夠反映樁網(wǎng)復(fù)合地基真實(shí)的工作性狀,其計(jì)算結(jié)果具有一定的可靠性。關(guān)鍵詞:樁網(wǎng)復(fù)合地基、沉降、力學(xué)模型、土拱效應(yīng)、摩阻力AbstractThepile—netcompositefoundationwerecomposedoffilledmaterials、reinforcedcushion、soilsin-betweenpiles、reinforceda
3、reasandsoilsunderlyingpiles,themechanismofitsworkwereverycomplicated.Inthispaper,theshapeoffour-partwereanalyzedrespectivelyatfirst.Thentheirmechanicalmodelandthebasicdifferentialequationswereestablished.Nextthevariouspartswerecomposedintoaunifiedwholetobuildagroupofsimultaneousequationsth
4、roughtheequilibriumequationsandboundaryconditions.Alsothecalculationmethodsfortheloadsharingratio、tensionforceofthereinforcement,pile—soilsettlement、elevationofequalsettlementplane、axialforceandskinfrictionofthepileswereobtained.Thelawofthesettlementandtheloadsharingratiowhichgowiththeload
5、andtimewereobtainedthroughthefieldtestintheBeijing··Shanghaihigh·-speedrailway.Numericalanalyseswerealsocarriedoutforthetypicaltestedsectionsusingtheplaxissoftware.Calculatedresultswereobtainedforthesettlements,loadsharing,thestressesandstrainsofthehorizontalreinforcement,andtheaxialforces
6、andskinfrictionsofthepiles.Atlasttheresultsfromtheanalyzingmodel,thefieldtestsandthenumericalanalyseswerecompared.Itverifiesthattheanalyzingmodelbuiltinthistextiscapableofreflectingtherealworkingbehaviorofthepile-netcompositefoundation.Thecalculatedresultsarereliableandapplicabletotheengin
7、eeringpractice.Keywords:pile-netcompositefoundation、settlement、mechanicalmodel、soilarchingeffect、skinfriction西南交通大學(xué)曲南父迥大罕學(xué)位論文版權(quán)使用授權(quán)書本學(xué)位論文作者完全了解學(xué)校有關(guān)保留、使用學(xué)位論文的規(guī)定,同意學(xué)校保留并向國家有關(guān)部門或機(jī)構(gòu)送交論文的復(fù)印件和電子版,允許論文被查閱和借閱。本人授權(quán)西南交通大學(xué)可以將本論文的全部或部分內(nèi)容編入有關(guān)數(shù)據(jù)庫進(jìn)行檢索,可以采用影印、縮印或掃描等復(fù)印手段保存和匯編本