基于ABAQUS的竖向荷载下三维桩土沉降变形分析  

Three-dimensional FEM analysis of settlement and deformation of pile-soil system under vertical load using ABAQUS

作　　者：盛志强[1] 石玉成[1,2,3] 孙军杰[1,2,3] 秋仁东[4] 卢育霞[1,2,3] 刘琨[1,2,3] 万秀红[1] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000 [2]中国地震局黄土地震工程开放试验室,甘肃兰州730000 [3]甘肃省岩土防灾工程技术研究中心,甘肃兰州730000 [4]中国建筑科学研究院地基基础研究所,北京100013

出　　处：《岩土工程学报》2013年第S1期366-371,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50878200)

摘　　要：利用ABAQUS有限元分析软件,采用Mohr-Coulomb准则,建立了桩土有限元三维计算模型,对竖向荷载下桩土作用进行分析,分别讨论了不同桩距、桩长、桩数的群桩基础沉降性状,并与模型试验结果进行比较。分析结果表明:在相同荷载下,增加桩距或桩长可减小沉降;随着桩数增加,桩基沉降也在增加,但在桩数为n=25×25之后继续增加桩数,沉降变化较小,是否可以通过计算桩数为n=25×25的群桩基础沉降来实现更大桩数的群桩桩基沉降设计值得进一步研究。By means of the finite element software named ABAQUS,the settlement and deformation of the pile-soil system under vertical load are analyzed.The foundations with pile groups can be divided into three categories: different pile spacings,different pile lengths,and different pile numbers.For numberical analysis,the Mohr-Coulomb criterion is adopted.Based on some large scale mode tests on pile groups,it is found that the results of 3D FEM analysis using ABAQUS software are convincing.The results show that the settlement of pile group foundation decreases if the pile spacing or length increases.Compared with the settlement and deformation of pile group foundation with different pile numbers,the settlement increases with the number of piles,nevertheless,the settlement value is stable when piles are larger than number 25×25.In other words,the change of the settlement of the pile foundation is not obvious with the increase of the pile number if it exceeds a certain level.Many researches should be done to show whether or not the foundation settlement of smaller number(25×25) of piles can be calculated,and the settlement of the foundation with larger number of piles meets the need of engineering design.

关 键 词：有限元 MOHR-COULOMB准则 桩土相互作用 沉降 群桩效应 

分 类 号：TU473.1[建筑科学—结构工程]