岩土力学Issue(11)：3321-3328,8.
孔隙率、级配参数对粉土双轴压缩性状影响的颗粒流分析
Analysis of particle flow for impacts of granular parameters and porosity on silt’s properties under biaxial compression
摘要
Abstract
To analyze the impact of geometrical particle parameters on macromechanical properties of the soil in particle flow method, the conversion formula of the granule number and modified porosity of numerical sample group in the 2D condition was proposed;and the numerical simulation and the laboratory model tests were carried out. It conducted 6 groups of parameter validation tests and 24 groups of variables cross-comparison biaxial compression tests, and included 4 types of gradations, 3 types of porosities and 2 kinds of contact models. The results show that the effect of porosity is larger than that of gradation on soil mechanical properties. With the increase of porosity, the peak value of soil strength gradually decreases; and the axial strains of corresponding points increase accordingly. Compared with the results of the Hertz-Mindlin (H-M) contact model which is focused on the nonlinear relation between the contact force and relative displacement;the results of the linear contact model are more reliable. Meanwhile the behavior of volumetric strain transited from dilatancy to negative dilatancy. And it is suggested when the porosity increases the H-M contact model reflected the subsequent dilatancy effect of soil after peak strength better.关键词
颗粒流/细观参数/级配/二维孔隙率/接触模型/双轴试验Key words
particle flow/meso-structure parameter/gradation/2D porosity/contact model/biaxial test分类
建筑与水利引用本文复制引用
徐国建,沈扬,刘汉龙..孔隙率、级配参数对粉土双轴压缩性状影响的颗粒流分析[J].岩土力学,2013,(11):3321-3328,8.基金项目
长江学者和创新团队发展计划资助(No. IRT1125)；国家自然科学基金资助项目(No.50909039)。 （No. IRT1125）
