单桩与群桩变形特征对比有限元分析.pdfVIP

D0I:10.1390dwjz.2023.2.027

单桩与群桩变形特征对比有限元分析

FINITEELEMENTANALYSISOFSOILARCHINGEFFECTOFSINGLEPILEANDPILEGROUPIN

东SOFTSOILFOUNDATION

崔军强，耿敏

（大连交通大学土木工程学院，辽宁大连116028）

CUIJunqiang,GENCMin

(SchoolofCivilEngineering,DalianJiaotongUniversity,LiaoningDalian116028,China)

【摘要】群桩基础广泛应用于建筑领域，为深入研究群桩基础作用详细机理，通过非线性有限元ABUQUS建立单桩与群桩模

型，研究轴力、桩土应力比、桩土差异沉降对单桩和群桩的影响，并计算群桩效率系数，优化桩承式加筋路堤设计参数。研究结

果表明，群桩基础相对于单桩基础承载力明显；通过分析桩土应力比变化规律，随着荷载的增大，中心桩、边桩、角桩的桩土应

力比逐渐变大；越靠近群桩基础中心的位置，桩间土承受的压力越小，在边缘处达到最大值。成果将丰富数值模拟研究并为实

践应用提供借鉴和参考。

【关键词】群桩；土拱效应；桩土应力比；轴力

【中图分类号】TU473.1【文献标志码】A【文章编号】1001-6864(2023)2-0126-04

Abstract:Pilegroupfoundationiswidelyusedintheconstructionfield.Inordertostudythedetailedmechanismof

pilegroupfoundation,thesinglepileandpilegroupmodelsareestablishedbynonlinearfiniteelementABUQUS.

Theeffectsofaxialforce,pile-soilstressratioandpile-soildifferentialsettlementonsinglepileandpilegroupare

studied.Theefficiencycoefficientofpilegroupiscalculatedandthedesignparametersofpile-supportedreinforced

embankmentareoptimized.Theresultsshowthatthebearingcapacityofpilegroupfoundationisobviouslyhigher

thanthatofsinglepilefoundation.Byanalyzingthevariationlawofpile-soilstressratio,withtheincreaseofload,

thepile-soilstressratioofcentralpile,sidepileandcornerpilegraduallyincreases.Theclosertothecenterofthe

pilegroupfoundation,thesmallerthepressureonthesoilbetweenthepiles,reachingthemaximumattheedge.The

resultswillenrichthenumericalsimulationresearchandprovidereferenceforpracticalapplication.

Keywords:pilegroup;soilarchingeffect;pile-soils