北京航空航天大学学报 ›› 2015, Vol. 41 ›› Issue (6): 976-981.doi: 10.13700/j.bh.1001-5965.2014.0434

• 论文 • 上一篇    下一篇

应力主轴旋转下砂土力学特性的数值模拟分析

童朝霞, 王勃, 左照坤, 姚仰平   

  1. 北京航空航天大学 交通科学与工程学院, 北京 100191
  • 收稿日期:2014-07-19 出版日期:2015-06-20 发布日期:2015-07-30
  • 通讯作者: 童朝霞(1976—),女,湖南岳阳人,副教授,tongzx@buaa.edu.cn,主要研究方向为岩土本构理论、土动力学与土工抗震等. E-mail:tongzx@buaa.edu.cn
  • 基金资助:
    水沙科学与水利水电工程国家重点实验室开放研究基金(sklhse-2014-D-01); 国家"973"计划(2014CB047006); 中央高校基本科研业务费专项资金(YWF-14-JTXY-007)

Discrete element simulation of mechanical characteristics of sands under principal stress axes rotation

TONG Zhaoxia, WANG Bo, ZUO Zhaokun, YAO Yangping   

  1. School of Transportation Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2014-07-19 Online:2015-06-20 Published:2015-07-30

摘要: 应力主轴旋转条件下砂土等颗粒材料的力学响应与细观组构及演化规律密切相关.通过将离散元数值模拟与室内物理试验在正应变分量发展、剪应力-剪应变关系曲线、体应变发展规律及影响因素等方面进行对比分析,验证了离散元数值模拟的有效性.在此基础上,将颗粒长轴定向组构特征和粒间接触法线组构特征分别用反映组构分布各向异性程度及主方向的变量表示,深入分析了应力主轴旋转条件下颗粒材料组构特征在一个循环周的演化规律,并同时考察了初始孔隙比和应力比对颗粒材料细观组构演化规律的影响.

关键词: 应力主轴旋转, 离散元数值模拟, 砂土, 力学特性, 细观组构

Abstract: The mechanical behavior of sands and other granular materials subjected to rotation of principal stress axes is significantly dependent on the micro fabric properties and their evolution. The discrete element simulation for sands under cyclic rotation of principal stress axes was validated by comparing the numerical simulation and laboratory test results on the development of two normal strains, the relationship between shear stress and shear strain, the evolution of the volumetric strain, and the effects of initial void ratio and stress ratio. Four variables characterized by the spatial distribution features of particle major axis orientation and inter-particle contact normal directions were used to describe the fabric properties of granular materials. The evolution of the four fabric variables in a single cycle was studied for granular materials subjected to cyclic rotation of principal stress axes. The effects of initial void ratio and stress ratio on the evolution of fabric variables were also investigated in detail.

Key words: principal stress axes rotation, discrete element numerical simulation, sand, mechanical characteristics, micro fabric properties

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