路堤下CFG桩复合地基承载特性有限元分析  

FEM analysis for bearing characteristics of CFG pile composite foundation under embankment

作　　者：蔡宁[1] 刘晓明[2] 马缤辉[3,2] 

机构地区：[1]湖南工程职业技术学院,长沙410002 [2]湖南大学土木工程学院,长沙410082 [3]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《工程勘察》2012年第3期1-6,共6页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金项目(50808076);湖南省科技推广重点项目(2007CK3065)

摘　　要：为深入分析路堤下CFG桩复合地基的承载特性,基于某路堤工程背景建立了CFG桩复合地基的平面有限元分析模型。模型采用导入初始地应力法模拟了初始应力场,利用"生死单元法"模拟了路堤分层填筑过程。有限元计算与实测曲线的对比验证了有限元模型及参数的正确性与合理性,并以此为基础分析了CFG桩复合地基的应力及变形,最后对CFG桩复合地基承载特性的相关影响因素进行了探讨,获得了一些有益结论,对实际工程具有一定的参考意义。In order to obtain the bearing characteristics of CFG composite foundation,the FEM model of CFG composite foundation is built based on an embankment engineering.The initial stress zones are simulated by the initial stress input method and the layering embankment construction are simulated by the birth-death element method.The validity and reasonability of FEM model and its parameters are verified by the comparison of computed and tested curves.Then the stresses and deformations of CFG pile composite foundation are obtained.Last the influence factors for the bearing characteristics of CFG composite foundation are discussed.Some useful conclusions are obtained which can be viewed as some guidances in the situ engineering.

关 键 词：CFG桩 承载特性 加固机理 有限元 ADINA软件 

分 类 号：TD353.6[矿业工程—矿井建设]