摘要
针对许多各向异性砂土强度和应变局部化特性,采用各向异性模型进行砂土的应变局部化分析。模型基于材料状态相关临界状态理论,采用宏细观结合的方法,将一个新的各向异性状态变量引入本构模型来描述砂土的各向异性,考虑细观组构张量和应力张量的几何关系模型即可以描述不同沉积角度三轴条件下砂土的力学特性。模型结合分叉理论可以自然解释各向异性和应变局部化对平面应变强度的影响,采用用一组模型参数可以很好模拟不同围压,不同沉积角度平面应变条件下Toyoura砂的强度特性和剪切带角度。
Aiming at the characters of strength and strain localization of some anisotropic sand, an anisotropic constitutive model for sand with the method of macro-micro incorporation is employed to analyze the strain localization of sand. A novel anisotropic state employed in the model which is based on the critical state and state-dependent theories and the method of macro-micro incorporation describes the anisotropy of sand. In view of the relationship of fabric and stress state, the model can describe the mechanical characters of anisotropic sand under drained triaxial condition. From the view of sand microstmcture, the model can explain the effect on the strength of plane strain tests when the shear band appears. One set of model constants can simulate well the strength responses and inclination angles of shear bands of Toyoura sand under different confining pressures and different bedding planes.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2012年第10期1772-1780,共9页
Chinese Journal of Geotechnical Engineering
基金
国家杰出青年科学基金项目(50825803)
关键词
各向异性强度
砂土
细观结构
应变局部化
anisotropic strength
sand
microstructure
strain localization
