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时间:2020-03-27
《大面积堆载下桥梁基桩负摩阻力试验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第41卷,第6期公路工程Vol.41,No.62016年12月HighwayEngineeringDec.,2016大面积堆载下桥梁基桩负摩阻力试验研究11222陈雪奖,周卫滨,邓会元,戴国亮,龚维明(1台州市沿海高速公路工程建设指挥部,浙江台州318000;2东南大学土木工程学院,江苏南京210096)[摘要]沿海地区主要通过吹填淤泥及泥沙进行围垦,由于吹填区域土质较差,淤泥软弱土层较厚,在后期填土作用下,土体会产生很大的固结沉降,易对桥梁基础产生较大的负摩阻力,降低基桩承载力,增加桥梁的沉降位移。结
2、合台州湾大桥工程建设,选取三根基桩进行大面积堆载下桥梁基桩负摩阻力试验,研究沿海吹填区域后期填土对桥梁基桩负摩阻力的影响,并结合不同理论方法计算值进行对比分析。现场实测结果表明,堆载高度达到4m高度,堆载面积为24m×16m时,负摩阻力总和达到2687kN左右,中性点深度约为295m,约为036倍桩长;负摩阻力的发展是随时间而变化的,规范法计算出的负摩阻力总和计算结果比实测结果偏大,在实际工程中应充分考虑负摩阻力的影响。[关键词]桥梁基桩;大面积堆载;固结;负摩阻力;理论计算[中图分类号]TU473[文
3、献标识码]A[文章编号]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
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