水利学报Issue(7)：772-778,7.
不同应力路径下颗粒材料细观结构分析
Analysis on microstructure of granular materials under different stress paths
摘要
Abstract
A biaxial compression test on granular materials is numerically simulated by DEM. The evolution of the microstructures of granular materials under different stress states is analyzed. A statistical parameter which characterizes the force chain structures is extended based on the microscopic expression of the soil skeleton in the soil mechanics. The evolutions of the proposed parameter under different stress paths are studied, and the rationality of the parameter to characterize the microstructure of the granular materials is verified. From which the mechanism of generation of sliding surface is explicated. Through describing the revolution of the force chain structures, the relationship between the microscopic and macroscopic views is set up,which explains the facts that the destroied sliding surface generally present around 45°+φ/2 in mac-roscopic trial from the mesoscopic mechanism, leading to a new idea to study the soil properties from the microscopic view.关键词
细观结构/颗粒材料/离散单元法/力链/土体骨架/应力路径Key words
microstructure/granular material/DEM/force chain/soil skeleton/stress path分类
建筑与水利引用本文复制引用
王子健,刘斯宏,王怡舒,孔维耀..不同应力路径下颗粒材料细观结构分析[J].水利学报,2013,(7):772-778,7.基金项目
国家自然科学基金资助项目（51179059）；江苏高校优势学科建设工程资助项目 （）
