离散元中破碎自组织对颗粒破碎影响研究

张科芬; 张升; 滕继东; 盛岱超

doi:10.11779/CJGE201804019

离散元中破碎自组织对颗粒破碎影响研究 English Version

张科芬^1,2,
张升^1,2, ,,
滕继东^1,2,
盛岱超^{1, 3}

1. 中南大学土木工程学院,湖南长沙 410075;
2. 中南大学高速铁路建造技术国家工程实验室,湖南长沙 410075;
3. 纽卡斯尔大学工程学院,澳大利亚 NSW2308;

基金项目: 国家重点基础研究发展计划（“ 973 ” 计划）项目（2014CB047001）; 中南大学研究生自主探索创新项目（2017zzts520）

详细信息

作者简介:
张科芬(1993- ),女,硕士,主要从事岩土材料颗粒破碎特性等方面的研究。E-mail：kfzhang0314@163.com。

通讯作者:
张升，E-mail：zhang-sheng@csu.edu.cn

中图分类号: TU431
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出版历程
- 收稿日期: 2017-01-17
- 发布日期: 2018-04-24

Influences of self-organization of granular materials on particle crushing based on discrete element method

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China;
3. School of Engineering, The University of Newcastle, NSW2308, Australia;

摘要

摘要: 从数学领域的阿波罗填充法入手,建立了4种破碎自组织,并借助线性膨胀法保证破碎前后质量守恒。在此基础上,开展了不同破碎自组织的数值试验,研究了破碎自组织对级配演化以及材料的宏细观力学特性等的影响。结果表明：颗粒级配曲线的分形维数和颗粒间的平均应力随破碎自组织中颗粒数目增多而下降,而相对破碎率B_r和材料的压缩性随自组织中颗粒数目增多而增大。加载过程中的法向接触和接触力玫瑰图表明,自组织中颗粒数目愈多,材料的各向异性程度愈低,颗粒法向接触数目愈多,而法向接触力愈小。另外,配位数及接触力的概率密度也与破碎自组织存在密切联系。
- 离散元 /
- 颗粒破碎 /
- 破碎自组织 /
- 阿波罗填充
Abstract: Starting from the Apollonian sphere packing method in mathematics, four kinds of self-organization of breakage are established, and the linear expansion method is introduced to guarantee the mass conservation. On this basis, the numerical experiments on different self-organizations are carried out, and the influences of self-organization on gradation evolution and macro and micro mechanical behaviors of granular materials are studied. It is found that the fractal dimension and the average inter-particle stress decrease with the increase of fragment number, while the relative breakage B_r and the compressibility increase with the increase of particle number in the self-organization. The anisotropic rose diagram of contact orientation and contact normal force show that the larger the number of particles in the self-organization is, the lower the anisotropy of the specimens at the end of loading is. In addition, the number of particle contact increases with the increase of self-organized particles, while the normal contact force decreases. Furthermore, the probability distributions of coordination number and contact force are also closely related to the self-organization of fragmentation.
- discrete element method /
- particle breakage /
- self-organization of grain breakage /
- Apollonian sphere packing

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参考文献(25)

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