第18卷增刊2地下空间与工程学报Vol.182022年12月ChineseJournalofUndergroundSpaceandEngineeringDec.2022U型槽下振冲碎石桩联合抗拔桩数值仿真分析李齐1,陈东霞1,2(1.厦门大学建筑与土木工程学院,福建厦门361005;2.厦门市交通基础设施智能管养工程技术研究中心,福建厦门361005)摘要:为研究某沿海下穿道路工程U型槽结构下碎石桩联合抗拔桩的抗浮效果,采用有限元软件ABAQUS建模,先分析振冲碎石桩对桩周土的挤土效应,将此振密挤密效果应用于抗拔桩侧阻力以及U型槽整体抗浮效果数值模拟分析中,结果表明:振冲碎石桩在单桩模型中桩周0.5m范围以内挤土效应最强,桩周土体位移可达0.2m,在群桩模型中桩周土体弹性模量能够得到较大的增强;与碎石桩实测荷载沉降曲线对比发现,数值模拟中采用初始桩半径0.2m,膨胀位移0.2m的参数设置能客观反映碎石桩挤密效应;整体模型数值模拟证实高水位砂性地层中振冲碎石桩联合抗拔桩的设计对U型槽抗浮效果最佳。结合规范中抗浮和沉降要求,U型槽底板的合理厚度宜为1.2m。关键词:振密挤密;抗浮效果;数值模拟;侧摩阻力中图分类号:TU43文献标识码:A文章编号:1673-0836(2022)增2-0743-09NumericalSimulationAnalysisonVibroflotationGravelPileCombinedwithUpliftPilesunderU-GrooveLiQi1,ChenDongxia1,2(1.DepartmentofCivilEngineering,XiamenUniversity,Xiamen,Fujian361005,P.R.China;2.XiamenEngineeringTechnologyCenterforIntelligentMaintenanceofInfrastructure,Xiamen,Fujian361005,P.R.China)Abstract:Inordertostudytheanti-floatingeffectofVibroflotationGravelPile(VGP)combinedwithupliftpileunderU-groovestructureofacoastalunderpassroadproject,thefiniteelementsoftwareABAQUSisusedtoanalyzethesoilcompactioneffectofVGPonthesoilaroundthepile,andthevibroflotationcompactioneffectisappliedtothenumericalsimulationanalysisoflateralresistanceofupliftpileandoverallanti-floatingeffectofU-groove.TheresultsshowthatthesoilsqueezingeffectofVGPisthestrongestwithin0.5maroundthepileinthesinglepilemodel,andthedisplacementofsoilaroundthepilecanreach0.2m.Inthepilegroupmodel,theelasticmodulusofsoilaroundthepilecanbegreatlyenhanced.ComparedwiththemeasuredloadsettlementcurveofVGP,itisfoundthattheparametersettingofinitialpileradiusof0.2mandexpansiondisplacementof0.2mcanobject...
