摘要
针对均质软黏土地基上扭剪荷载作用下桶形基础的破坏包络面,运用大型有限元分析软件ABAQUS进行了三维非线性数值分析.通过比较系统的数值计算与分析,分别考察了V-T、H-T、V-H-T空间内桶形基础的地基破坏模式以及破坏包络面特性,进而推导了其破坏包络面的拟合数学表达式.由此表明:(1)桶形基础在扭剪荷载作用下,以桶体中心为圆心,形成圆形塑性区,并且不断地向外扩展,距离桶体越近的区域塑性应变相对较为显著;(2)V-T、H-T空间内桶形基础的承载力性能随着桶体长径比(L/D)的增大而提高;(3)推导的破坏包络面拟合数学表达形式,可以近似地表达桶形基础的承载性能,以此评价扭剪荷载作用下桶形基础的稳定性.
Based on three-dimensional nonlinear numerical analysis, failure envelopes of bucket foundation subjected to torsion shear loading in soft clay was investigated. The general-purpose finite element software ABAQUS was utilized and numerical computations were conducted. Through the numerical analyses, failure mechanisms and envelopes for combined loading (V-T, H-T, V-H-T)of bucket foundation was reviewed. Furthermore, the mathematical expression of failure envelope was deduced. According to those analyses and derivation, it was obtained that: (1) Under torsion shear loading, the circular plastic failure area was outward-extending, which was as center of foundation as rotating center. The closer the distance to foundation was, the more notable plastic failure was. (2) The bearing capacity of bucket foundation in V-T, H-T load spaces was increasing with the increase of the L/D. (3) The mathematical expression of failure envelope was deduced, which was used to approximate express the features of bearing capacity. And it was also used to evaluate the stability of bucket foundation.
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2012年第5期777-786,共10页
Journal of Basic Science and Engineering
基金
中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK0910)
电力青年科技创新项目(20110515)
中国博士后科学基金项目(200904501211)
关键词
扭剪
桶形基础
有限元分析
承载力
ABAQUS
Bearing capacity
Failure (mechanical)
Finite element method
Torsional stress
