砂土颗粒三维形状模拟离散元算法研究

张程林; 周小文

doi:10.11779/CJGE2015S1023

砂土颗粒三维形状模拟离散元算法研究 English Version

张程林^{1, 2},
周小文¹

1. 华南理工大学亚热带建筑科学国家重点实验室,广东广州 510641; 2. 广州市建筑科学研究院有限公司,广东广州 510440

基金项目: 亚热带建筑科学国家重点实验室自主研究项目（2014ZA03）

详细信息

作者简介:
张程林(1983- ),男,博士,主要从事桩基检测,地基基础设计施工等。

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出版历程
- 收稿日期: 2015-03-25
- 发布日期: 2015-07-24

Algorithm for modelling three-dimensional shape of sand based on discrete element method

ZHANG Cheng-lin^{1, 2},
ZHOU Xiao-wen¹

1. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China; 2.Guangzhou Institute of Building Science Co., Ltd., Guangzhou 510440, China

摘要

摘要: 砂土颗粒形状对砂土宏观性质具有重要的影响。砂土颗粒形状的量化和构造是本文研究的主要内容。在离散元重叠颗粒族ODEC（overlapping discrete element cluster）方法的基础上提出了一种新的基于加权圆度的处理方法。首先是利用颗粒三视图提取二维圆度信息并对其进行加权平均,得到反映颗粒三维形状特性的加权圆度;然后在Matlab中创建具有指定加权圆度的三维凸包,对凸包进行体素化和骨架化处理后提取颗粒的三维空间信息;再利用PFC^3D重建具有指定形状的clump块体,生成不同外轮廓特性的颗粒组,以此模拟各种形状的砂土颗粒。
- 颗粒形状 /
- 加权圆度 /
- 离散元法 /
- 数值模拟
Abstract: The mechanical properties and characteristics of sand are significantly affected by particle shape. This paper is mainly aimed to quantify and build the grain shape. A new method based on ODEC (overlapping discrete element cluster) method is proposed. Firstly, the two-dimensional roundness of a particle in three projection planes is extracted through photography, and the weighted average roundness is calculated. Then the weighted average roundness is employed of particles to generate particles with various irregular shapes in numerical model through Matlab code and clump block function of PFC^3D.
- particle shape /
- weighted roundness /
- discrete element method /
- numerical simulation

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参考文献(11)

[1]	刘清秉, 项伟, BUDHU M, 等. 砂土颗粒形状量化及其对力学指标的影响分析[J]. 岩土力学, 2011, 32(增刊1). (LIU Qing-bing, XIANG Wei, BUDHU M, et al. Study of particle shape quantification and effect on mechanical property of sand [J]. Rock and Soil Mechanics, 2011, 32(S1). (in Chinese))
[2]	孔亮, 彭仁. 颗粒形状对类砂土力学性质影响的颗粒流模拟[J]. 岩石力学与工程学报, 2011, 30(10): 2112-2119. (KONG Liang, PENG Ren. Particle flow simulation of influence of particle shape on mechanical properties of quasi-sand[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(10): 2112-2119. (in Chinese))
[3]	ASHMAWY A K, SUKUMARAN B, HOANG A V. Evaluating the influence of particle shape on liquefaction behavior using discrete element method[C]// Proceeding of the Thirteenth International Offshore and Polar Engineering Conference. Hawaii, 2003: 542-549.
[4]	SALLAM A M. Studies on modeling angular soil particles using the discrete element method tampa[D]. Florida: University of South Florida, 2004.
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[6]	LIN X, NG T T. A three-dimensional discrete element model using arrays of ellipsoids[J]. Géotechnique, 1997, 47(2): 319-329.
[7]	MATSUSHIMA T. 3-D image-based discrete element modeling for irregularly-shaped grains[C]// 2nd International PFC Symposium. Kyoto, 2004.
[8]	TIAN X, HAN G, LI Z, et al.3D skeletonization and its application in plant root image analysis[J]. Journal of Computational Information Systems, 2005, 1(2): 241-246.
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砂土颗粒三维形状模拟离散元算法研究 English Version

作者简介: 张程林(1983- ),男,博士,主要从事桩基检测,地基基础设计施工等。

计量

出版历程

Algorithm for modelling three-dimensional shape of sand based on discrete element method

计量

出版历程

目录

作者简介:
张程林(1983- ),男,博士,主要从事桩基检测,地基基础设计施工等。