摘要
提出了无黏性土中剪切带的形成机理 ,并利用耦合的有限元数值分析加以验证。研究表明剪切带的形成与材料本身的软化特性密切相关。剪切带形成后 ,土体中存在两种变形模式 :剪切带内土的特性表现为应变软化 ,而其他部分的土体表现为卸载。此外 ,剪切带内土体的体积变形比其他部分的体积变形大得多。当剪应变超过某一水平时 。
The mechanism of formation of shear band in cohesionless soils is presented and verified by a fully coupled FEM procedure. The numerical analyses show that the initiation of shear band is related to softening behavior of material, and upon the occurrence of shear band,there are two different shear modes exerted in the soil body: within the localized zone, the constitutive relationship is characterized by softening loading, while unloading takes place at the most parts far from it. Moreover, the volumetric strain within shear band is significantly larger than that beyond it, and critical state occurs locally at large global strain level.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2003年第2期129-134,共6页
Chinese Journal of Geotechnical Engineering
关键词
剪切带
无黏性土
数值分析
临界状态
shear band
cohesionless soil
numerical analyses
softening loading
critical state
