| 描述砂性土宏细观力学关系的数学模型 |
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| 引用本文： | 闫洪超,鲁杰,饶振兴,翟洪涛,关鹏.描述砂性土宏细观力学关系的数学模型[J].科学技术与工程,2022,22(2):660-665. |
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| 作者姓名： | 闫洪超 鲁杰 饶振兴 翟洪涛 关鹏 |
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| 作者单位： | 河南省地质矿产勘查开发局 第四地质勘查院;中国地质大学 工程学院 |
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| 基金项目： | 深埋超长输水隧洞钻爆法开挖段软弱围岩工程灾害的形成机制及防控研究 |
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| 摘 要： | 土体等颗粒材料在外力作用下的细观颗粒层面的力学行为决定着其宏观力学性质.然而,目前已经提出的宏细观本构关系多基于对某一种试验数据的唯象总结,缺乏普适性.根据已有的理论研究成果,基于Hertz接触理论,采用颗粒流离散元程序(particle flow code,PFC3D)模拟了粒状砂性土的单轴压缩试验,推导了一种更具普...
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| 关 键 词： | 离散元 颗粒材料 组构 单轴压缩 宏细观 |
| 收稿时间： | 2021/2/5 0:00:00 |
| 修稿时间： | 2021/11/12 0:00:00 |
A mathematical model describing the macro- and micro-stress relationship of sandy soil |
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| Yan Hongchao,Lu Jie,Rao Zhenxing,Zhai Hongtao,Guan Peng.A mathematical model describing the macro- and micro-stress relationship of sandy soil[J].Science Technology and Engineering,2022,22(2):660-665. |
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| Authors: | Yan Hongchao Lu Jie Rao Zhenxing Zhai Hongtao Guan Peng |
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| Institution: | The Fourth Geological Exploration Institute of Henan Geology and Mineral Exploration Bureau |
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| Abstract: | The contact force network characteristics of granular materials such as soil can be quantified by fabric tensor. On the other hand, the macroscopic stress tensor can be determined by the magnitude of the inter-particle contact force and the distance between the centroids of two particles in contact. According to the existing theoretical research results, based on the Hertz contact theory, the particle flow discrete element program PFC3D is used to simulate the uniaxial compression test of granular soil for auxiliary analysis and verification. Based on this, a semi-empirical formula for predicting the anisotropy of contact force fabric from the macroscopic stress tensor is derived. The research results provide a new way to establish the connection between macro-mechanics and granular-level micro-mechanics. |
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| Keywords: | discrete element modeling granular materials fabric uniaxial compression multiscale |
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