摘要
当吸力式桶形基础承受竖向荷载作用时,其周围地基容易发生整体剪切破坏,由主应力旋转引起的非共轴现象不容忽视.基于有限元软件ABAQUS二次开发端口UMAT,将非共轴本构模型应用到桶形基础的竖向地基承载力问题的有限元计算中.结果表明,非共轴模型对地基的整体剪切破坏模式没有影响,但是对地基竖向承载力-位移曲线具有显著的软化作用,同时,对地基的竖向极限承载力具有降低作用.如果通过竖向位移来确定地基容许承载力,则非共轴模型得到的计算结果是比较安全的.
When the suction bucket is subjected to vertical load, it is very easy to induce the integral shear failure of the foundation surrounding the bucket. However, it is not reasonable to ignore the non-coaxial phenomenon, which is caused by the principal stress rotation. Based on the UMAT of FEM software ABAQUS, the non-coaxial model is adopted into the numerical analysis of vertial suction bucket foundationrs bearing capacity problem. The results show that the non-coaxial model has little influence on the integral shear failure mechanism of the foundation, but it not only has a visible softening effect on the bearing capacity-settlement curve, but also decreases the vertical ultimate bearing capacity of the foundation. Itrs safe to take the non-coaxial model into the assessment of the foundation＇s bearing capacity, which is often determined by the vertical displacement.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2012年第4期553-558,共6页
Journal of Dalian University of Technology
基金
国家自然科学基金资助项目(51079018)
关键词
非共轴
数值积分
地基承载力
吸力式桶形基础
non-coaxial
numerical integration
foundation bearing capacity
suction bucket
