資源描述:
《大面積堆載作用下軸向受力隔離樁的承載機(jī)制分析-論文.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在應(yīng)用文檔-天天文庫(kù)。
1、第33卷第2期巖石力學(xué)與工程學(xué)報(bào)Vl0l_33N0.22014年2月ChineseJournalofRockMechanicsandEngineeringFeb.,2014大面積堆載作用下軸向受力隔離樁的承載機(jī)制分析竺明星,龔維明~,徐國(guó)平,何小元fI.東南大學(xué)土木工程學(xué)院,江蘇南京210096;2.東南大學(xué)混凝土及預(yù)應(yīng)力混凝土結(jié)構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室,江蘇南京2100963.中交公路規(guī)劃設(shè)計(jì)院有限公司,北京100010)摘要:為分析大面積堆載作用下軸向受荷隔離樁的被動(dòng)受力特性,首先從布辛奈斯克(Boussinesq)改進(jìn)解
2、出發(fā),推導(dǎo)出各種形式堆載作用下水平附加壓力的理論計(jì)算公式;在此公式基礎(chǔ)上,從土體的運(yùn)動(dòng)和應(yīng)力的傳遞方式入手,對(duì)考慮土拱效應(yīng)的局部塑性變形理論進(jìn)行改進(jìn),從而得到合理的隔離樁樁身被動(dòng)荷載分布;最后,根據(jù)考慮土體局部塑性屈服及軸向荷載重力二階效應(yīng)影響的三參數(shù)Winkler彈性地基梁模型,建立樁身彈性段與塑性段的微分方程組,求解過(guò)程中采用矩陣傳遞法結(jié)合Laplace正逆變換的方法解得隔離樁樁身被動(dòng)受力特性的數(shù)值解,并用試驗(yàn)數(shù)據(jù)進(jìn)行驗(yàn)證。結(jié)果表明,數(shù)值解與模型試驗(yàn)實(shí)測(cè)值吻合較好,本研究中關(guān)于被動(dòng)樁的求解方法具有較高的應(yīng)用與參考價(jià)值
3、。關(guān)鍵詞:樁基礎(chǔ);堆載;隔離樁;Laplace正逆變換;矩陣傳遞法中圖分類號(hào):Tu472文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000—6915(2014)02—0421—12ANALYSISOFBEARINGMECHANISMOFAXIALLYLoADEDISoLATIoNPILESUNDERLARGE.SCALESURCHARGELoADINGZHUMingxing1GONGWeiming1。。XUGuoping,HEXiaoyuan1,,f1.SchoolofCivilEngineering,SoutheastUniversit
4、y,Nanjing,Jiangsu210096,China;2.KeyLaboratoryofConcreteandPrestressedConcreteStructuresofMinistryofEducation,SoutheastUniversity,Nanjing,Jiangsu210096,China;3.CCCCHighwayConsultantsCo.,Ltd.,Beijing100010,China)Abstract:Thispaperaimsatanalyzingthepassivemechanical
5、characteristicsofaxiallyloadedisolationpilesunderlarge-scalesurchargeloading.Firstly,theformulationforcalculatinglateraladditionalpressurewithlocalsurchargeisdeducedbasedonthesolutionofimprovedBoussinesq.Thenaccordingtosoilmovementandstresstransferapproach,therat
6、ionalpassiveloaddistributionofisolationpilesisobtainedbyimprovinglocaldeformationtheoryofplasticityconsideringsoilarching.Finally,diferentialequationsofelasticandplasticregionsofisolatedpilesareestablishedbyconsideringthegravitysecond-orderefectcausedbylateralloa
7、dandyieldofsoilfortri-parameterWinklerelasticfoundationbeammode1.CombiningmatrixtransfermethodwithLaplaceforwardandinversetransformation,thenumericalsolutionofpassivemechanicalfeaturesofisolationpilesisobtained.Later,theproposedapproachisverifiedbythetestdata.The
8、resultsindicatethatthenumericalandmeasuredresultsareingoodagreement,andtheproposedapproachisapplicableinengineeringpractice.Keywords:pilefoundations:surchargel