砂土的细观参数对宏观特性的影响研究  

Influence of Micro Parameters of Sandy Soil on Its Macro Properties

作　　者：曾远[1] 周健[2] 

机构地区：[1]中交第三航务工程勘察设计院,上海200032 [2]同济大学地下建筑与工程系,上海200092

出　　处：《地下空间与工程学报》2008年第3期499-503,共5页Chinese Journal of Underground Space and Engineering

摘　　要：基于颗粒流理论,对砂土的室内双轴试验进行了数值模拟,在前人的基础上对颗粒形状和边界条件做了一些改进,采用不规则颗粒代替纯圆形颗粒,用柔性的颗粒边界代替刚性的墙边界。研究了颗粒形状、摩擦系数、孔隙率等细观参数变化对宏观特性的影响。并对计算模型中颗粒单元的性质进行了多组试样的参数比较研究,建立了宏观参数和细观参数的定量对应关系。对研究土体的本构模型具有一定的应用价值。Based on the theory of Particle Flow Code （ PFC）, the biaxial test of sandy soil are simulated. Referring to research achievements, in this paper with improving particle shape and boundary condition, instead of circle partitle rigid wall boundary irregular particle and flexible particle boundary are used. The variation rules of macro properties of the sand sample with micro parameters, such as particle size, friction coefficient and porosity of particle, are studied. Different macro properties corresponding to the particle parameters are studied to acquire the quantitative relation between micro parameters and macro properties. The results are valuable for developing soil constitutive models.

关 键 词：颗粒流 砂土 细观参数 数值模拟 

分 类 号：TU411[建筑科学—岩土工程]