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1、第41卷,第6期公路工程Vol.41,No.62016年12月HighwayEngineeringDec.,2016大面積堆載下橋梁基樁負(fù)摩阻力試驗(yàn)研究11222陳雪獎,周衛(wèi)濱,鄧會元,戴國亮,龔維明(1臺州市沿海高速公路工程建設(shè)指揮部,浙江臺州318000;2東南大學(xué)土木工程學(xué)院,江蘇南京210096)[摘要]沿海地區(qū)主要通過吹填淤泥及泥沙進(jìn)行圍墾,由于吹填區(qū)域土質(zhì)較差,淤泥軟弱土層較厚,在后期填土作用下,土體會產(chǎn)生很大的固結(jié)沉降,易對橋梁基礎(chǔ)產(chǎn)生較大的負(fù)摩阻力,降低基樁承載力,增加橋梁的沉降位移。結(jié)
2、合臺州灣大橋工程建設(shè),選取三根基樁進(jìn)行大面積堆載下橋梁基樁負(fù)摩阻力試驗(yàn),研究沿海吹填區(qū)域后期填土對橋梁基樁負(fù)摩阻力的影響,并結(jié)合不同理論方法計(jì)算值進(jìn)行對比分析?,F(xiàn)場實(shí)測結(jié)果表明,堆載高度達(dá)到4m高度,堆載面積為24m×16m時(shí),負(fù)摩阻力總和達(dá)到2687kN左右,中性點(diǎn)深度約為295m,約為036倍樁長;負(fù)摩阻力的發(fā)展是隨時(shí)間而變化的,規(guī)范法計(jì)算出的負(fù)摩阻力總和計(jì)算結(jié)果比實(shí)測結(jié)果偏大,在實(shí)際工程中應(yīng)充分考慮負(fù)摩阻力的影響。[關(guān)鍵詞]橋梁基樁;大面積堆載;固結(jié);負(fù)摩阻力;理論計(jì)算[中圖分類號]TU473[文
3、獻(xiàn)標(biāo)識碼]A[文章編號]1674—0610(2016)06—0082—07FieldTestonNegativeSkinFrictionofBridgePileFoundationUnderLargeScaleVerticalSurchargeLoads11222CHENXuejiang,ZHOUWeibin,DENGHuiyuan,DAIGuoliang,GONGWeiming(1TheCoastalHighwayConstructionHeadquartersofTaizhouCity,Taizhou
4、,Zhejiang318000,China;2DepartmentofCivilEngineering,SoutheastUniversity,Nanjing,Jiangsu210096,China)[Abstract]Thesoilofcoastalreclamationareaismuchpoor,andthesiltisverythickThesoilwillproducegreatconsolidationsettlementundertheeffectoflatefillingsoil,whi
5、chmakesbridgepilefoundationproducenegativeskinfrictioneasilyItwillincreasetheloadofbridgepilefoundation,andreducethebearingcapacityandincreasethesettlementofpilefoundationCombinedwiththeTaizhouBayBridgeProjectConstruction,thefieldtestarestudiedtowardsth
6、eeffectofcoastalreclamationarealatefillingtonegativeskinfrictionresistanceofpilefoundationofbridge,andtherearethreepilesdesignedtotestInaddition,itcombineswithdifferenttheoreticalcalculationmethodstoanalysisnegativeskinfrictionAccordingtothefieldtest,wh
7、entheloadheightisupto4meterandthesurchargeloadscaleis24m×16m,thetotalnegativeskinfrictionisalmostupto2687kN,andthedepthofneutralpointisabout295meter,nearlybeing036timesthepilelengthBesides,thedevelopmentofnegativeskinfrictionchangesovertimeTheresultofd
8、omesticnormanalysisislargerthanfieldtestresultThenegativefrictionshouldbetakenfullyintoconsiderationinactualengineering[Keywords]bridgepilefoundation;largescaleverticalsurchargeloads;consolidation;negative