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1、水平受荷大尺寸钢管桩离心数值试验研究江洎洧*,程展林,潘家军,张伟,李波(长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010)摘要:大尺寸钢管桩是近海风电场建设中最常用的单桩基础之一。基于水平受荷钢管桩离心物理试验成果,以三维有限差分方法为技术手段开展离心数值试验,深入揭示桩-土相互作用关系。研究表明:水平受荷下钢管桩侧向变形显著受控于土层弹性模量;从桩顶变形、桩身挠度及弯矩分布等方面对比离心物理模型试验与离心数值试验成果,根据各级水平荷载条件下两者吻合程度确定参数优化方案,在此基础上提取水平受荷条件下钢管桩不同埋深截面区间的荷载-位移(p-y)关系,进
2、而系统研究不同层位地基土所提供的水平抗力及其分布规律。物理试验和数值试验相结合可有效克服物理试验中监测数据有限、监测工具布设困难等缺点;该研究方法在获取水平受荷桩p-y曲线方面具有普遍适用性,可供实际工程中桩基水平承载力设计参考。关键词:大尺寸钢管桩;离心数值试验;水平受荷;桩-土相互作用;p-y曲线中图分类号:文献标志码:ANumericalCentrifugalTestStudyonLarge-diameterSteelPipePileunderHorizontalLoadJIANGJiwei*,CHENGZhanlin,PANJiajun,ZHANGWei,L
3、IBo(ChangjiangRiverScientificResearchInstitute,KeyLaboratoryofGeotechnicalMechanicsandEngineeringofTheMinistryofWaterResources,Wuhan430010,China)Abstract:Large-diametersteelpipepileisakindofsinglepilethatwidelyusedinoffshorewidefarm.Basedonthecentrifugalmodeltestresultsforlarge-diamete
4、rsteelpipepileunderhorizontalload,using3Dfiniteelementmethod,weconductedthecentrifugalnumericaltestinordertorevealthepile-soilinteraction.Theresultsshowthatthelateraldeformationofsteelpipepileunderhorizontalloadisobviouslycontrolledbytheelasticmodulusofsoillayer;basedoninverseanalysis,
5、centrifugalmodeltestandcentrifugalnumericaltestwascomparedfromtheaspectsofthedistributionsoflateraldeformationonpiletop,thedeflectionandbendingmomentalongthepile.Accordingtothecomparabilityundereachhorizontalloadlevel,theparameteroptimizationschemewasdetermined.Then,theload-displacemen
6、trelationshipofsteelpipepileatdifferentdepthsunderhorizontalloadisobtained,andthedistributionofthehorizontalresistanceoffoundationindifferentsoillayersissystematicallystudied.Combinationofmodeltestwithnumericaltestcanovercomethelimitationofmonitoringdata,andthedifficultyinsettingenough
7、monitoringinstrumentsinthepile-soilmodel.Thisresearchmethodisgeneralusefulforobtainingtheload-displacementrelationship(p-ycurve),andcouldbereferencesforthehorizontalbearingcapacitydesignofpileinpracticalengineering.KeyWords:Large-diametersteelpipepile;Centrifugalnumericaltest;horizon