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双剪类流动模型的非圆形颗粒离散元数值验证

蒋明镜, 李立青, 申志福

蒋明镜, 李立青, 申志福. 双剪类流动模型的非圆形颗粒离散元数值验证[J]. 岩土工程学报, 2013, 35(4): 619-626.
引用本文: 蒋明镜, 李立青, 申志福. 双剪类流动模型的非圆形颗粒离散元数值验证[J]. 岩土工程学报, 2013, 35(4): 619-626.
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JIANG Ming-jing, LI Li-qing, SHEN Zhi-fu. Evaluation of double-shearing type kinematic models for granular flows by use of distinct element methods for non-circular particles[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(4): 619-626.
Citation: JIANG Ming-jing, LI Li-qing, SHEN Zhi-fu. Evaluation of double-shearing type kinematic models for granular flows by use of distinct element methods for non-circular particles[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(4): 619-626.
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双剪类流动模型的非圆形颗粒离散元数值验证  English Version

  • 1. 同济大学岩土及地下工程教育部重点实验室，上海 200092; 2. 同济大学地下建筑与工程系，上海 200092; 3. 河南省交通科学技术研究院有限公司，河南 郑州 450006

基金项目: 国家杰出青年基金项目（51025932）；国家自然科学基金项目（10972158，51179128）；上海优秀学术带头人计划项目（11XD1405200）
详细信息
    作者简介:

    蒋明镜（1965- ），男，教授，博士生导师，国家杰出青年基金获得者，“同济大学特聘教授”，日本JSPS外籍研究员，加拿大和英国两站的岩土工程出站博士后，主要从事天然结构性黏土、砂土、非饱和土、太空土、深海能源土的宏微观试验、本构模型和数值分析方面的研究以及土体逐渐破坏分析。E-mail: mingjing.jiang@tongji.edu.cn。

  • 中图分类号: TU44

Evaluation of double-shearing type kinematic models for granular flows by use of distinct element methods for non-circular particles

  • 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Dept. of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. Henan Transportation Research Institute Co., Ltd., Zhengzhou 450006, China

摘要

    摘要
  • 摘要: 双滑移自由转动模型、双剪模型和双滑移转动率（DSR2）模型这3种双剪类模型均是基于运动理论的塑性模型，其关键区别在于转动率参量的选取。采用改进后的NS2D离散元程序，对长短轴比例分别为1.4和1.7的椭圆颗粒试样进行不排水单剪试验以验证上述双剪类模型中转动率参量选取的合理性。数值试验结果表明：①双滑移自由转动模型中的限定条件因未考虑能量消散过程中颗粒转动的影响而过于严格；②双剪模型中转动率参量为主应力方向变化率的假定与数值试验结果差距显著；③DSR2模型中采用平均纯转动率（APR）可很好地预测转动率参量的变化，且该模型可用于砂土非共轴微观机制的研究；④参量APR能考虑剪切过程中颗粒转动对能量耗散的影响，可将离散介质力学和连续介质力学有机结合起来，是运动模型中合理且重要的参量。
    Abstract: The double-sliding free-rotating model, double-shearing model and double-slip and rotation rate model (DSR2 model) are three types of double-shearing kinematic models, which formulate the plastic flows of granular materials. These models incorporate different physical interpretations of angular velocity. A developed distinct element method program NS2D is used to generate assemblages which are composed of elliptical particles with aspect ratios of 1.4 and 1.7, respectively. The assemblages are then subjected to undrained simple shear tests to validate the above-mentioned models. The results show that: (1) the postulation in the double-sliding free-rotating model seems to be unduly restrictive for not considering the effect of particle rotation on energy dissipation; (2) a quantitative and qualitative difference between the observed rotation rate of the major principal stress axes and the theoretic angular velocity does not support the double-shearing model; (3) the DSR2 model presents a successful prediction of the angular velocity by means of the averaged micro-pure rotation rate (APR), and it can be used to study the non-coaxiality of granular materials; and (4) the APR is a rational and important variable which considers the effect of particle rotation in the energy dissipation process, and bridges discrete and continuum granular mechanics.
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    A developed discrete element model NS2D for simulating mechanical properties of elliptical particles assemblages[J]. Rock and Soil Mechanics, 2011, 32S1: 713-718. (in Chinese)
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出版历程
  • 收稿日期:  2012-01-07
  • 发布日期:  2013-04-17

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