东南大学学报（英文版）2020，Vol.36Issue(2)：188-197,10.DOI:10.3969/j.issn.1003-7985.2020.02.009
竖向、水平与弯矩荷载联合作用下沉井基础破坏包络线研究
Failure envelope of a caisson foundation under combined vertical,horizontal and moment loadings
摘要
Abstract
To investigate the bearing capacity of a caisson foundation under combined vertical,horizontal and moment loadings,the three-dimensional finite element analyses of a circular caisson foundation in homogenous sandy soil subjected to combined loadings are conducted.The caisson model has a depth to breadth ratio equaling one,and a soil-caisson interface friction coefficientμ =0.3.First,the responses of caisson foundations under uniaxial vertical loading V,horizontal loading H and moment loading M are examined.Moreover,the responses of caisson foundations under combined vertical-horizontal V-H,vertical-moment V-M and horizontal-moment H-M load space are studied and presented using normalized failure envelopes generated by the load-controlled method.Subsequently,the bearing behavior of caisson foundations under combined vertical-horizontal-moment V-H-M load space,as well as the kinematic mechanisms accompanying the failure under uniaxial and combined loading,are addressed and presented for different vertical load ratios V/Vu.Finally,three equations that approximate the three-dimensional shape of the failure locus are proposed,which provides a convenient means of calculating the bearing capacity of a caisson foundation subjected to uniaxial and combined vertical,horizontal and moment loadings.关键词
沉井基础/破坏包络线/有限元分析/承载力/砂性土Key words
caisson foundation/failure envelope/finite element analysis/bearing capacity/sandy soil分类
建筑与水利引用本文复制引用
Abdellatif Boucheloukh,龚维明,戴国亮,竺明星..竖向、水平与弯矩荷载联合作用下沉井基础破坏包络线研究[J].东南大学学报（英文版）,2020,36(2):188-197,10.基金项目
The National Natural Science Foundation of China (No.51808112,51878160,51678145),the Natural Science Foundation of Jiangsu Province (No.BK20180155). （No.51808112,51878160,51678145）
