摘要
颗粒体系由大量离散颗粒组成,普遍存在于自然界中,比如砂土地基、泥石流及滑坡体等。外荷载通常沿着准直形的路径在体系内传递,形成区别于单个颗粒和整个体系的细观结构——力链,亦即颗粒物质具有典型的多尺度特征。采用颗粒离散元方法模拟刚性块体压入颗粒体系的过程,计算得到了刚性块体底部所受阻力与压入深度的幂率关系;给出力链的判断准则和搜索强力链程序,构建颗粒体系强力链网络,并分析了压入试验过程中力链的演变及其长度的分布规律。
A granular assembly is a conglomeration of discrete solid and exists in nature widely,such as sand foundations,debris flows and landslides,etc.It is found that external loads generally transmit along the quasi-linear path in the granular assembly,and a special mesoscale structure between a single particle and the entire system,called a force chain,is formed.In other words,granular matter has the typical characteristics of multi-scale.A series of discrete element simulations are conducted on a static granular assembly subjected to indentation by a rigid flat punch.By proposing three conditions for defining a force chain,the evolution of the strong force chain network is presented.The distribution of strong force chain length during the indentation of the punch is also analyzed.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第S1期88-92,98,共6页
Rock and Soil Mechanics
基金
清华大学水沙科学与水利水电工程国家重点实验室自主项目资助课题(No.2008-ZY-6)
关键词
颗粒物质
压入试验
力链
多尺度
granular matter
indentation test
force chains
multi-scale
