考虑颗粒破碎效应的粒状材料本构研究：进展及发展

尹振宇; 许强; 胡伟

考虑颗粒破碎效应的粒状材料本构研究：进展及发展 English Version

尹振宇¹²,
许强²,
胡伟²

1. 上海交通大学土木工程系，上海 200240;
2. 成都理工大学地质灾害防治与地质环境保护国家重点实验室，四川成都 610059

详细信息

作者简介:
尹振宇(1975- )，男，浙江瑞安人，博士，研究员，博士生导师，主要从事土体本构关系的建立及应用方面的研究与教学工作。E-mail: zhenyu.yin@gmail.com。

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- 收稿日期: 2011-11-14
- 发布日期: 2012-12-24

Constitutive relations for granular materials considering particle crushing:review and development

1. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China

摘要

摘要: 颗粒破碎会引起材料的压缩性变大及强度软化，因此颗粒破碎对粒状材料力学特性影响的研究非常重要。首先从试验研究方面着手，总结了颗粒破碎的描述方法、不同加载条件下（一维及等向压缩、三轴剪切、扭剪及单剪）应力应变的颗粒破碎效应；接着总结了考虑颗粒破碎效应的粒状材料力学本构模拟方法，即一维及等向压缩模型、三维剪切模型及基于离散元法的微观土力学模型。最后，通过大量试验结果分析并结合笔者近年来的研究成果，指出可破碎颗粒材料在应力应变过程中的颗粒级配变化可由修正相对破碎指数来表示，可通过塑性功来确定，且塑性功确定法的优越性还体现在循环加载下的累积破碎评价；然后再通过修正相对破碎指数，来确定临界状态线的位置，进而可通过当前状态与临界状态线的相对位置来评价颗粒破碎对颗粒材料力学特性的影响。所提出的以修正相对破碎指数为关键变量的本构方程可直接应用于考虑颗粒破碎效应的粒状材料静动力本构模型的开发。
- 砂土 /
- 颗粒破碎 /
- 颗粒级配 /
- 塑性功 /
- 临界状态线 /
- 循环加载
Abstract: Particle crushing often results in more compressibility and less strength for granular assemblies. Therefore, the researches on the influences of particle crushing on the mechanical behavior of soils are important. First, experimental studies are summarized, including the descriptive methods for particle crushing and the impact of breakage on the stress-strain relationship under different loading conditions (one-dimensional and isotropic compression, triaxial shearing, torsional and simple shearing, etc.). Then, different modeling methods are summarized compression model, three-dimensional model and discrete element method-based modeling. Finally, through experimental investigations and the authors' researches in recent years, it is noted that the modified relative breakage index can be well adopted to represent the change of grain size distribution due to particle crushing during stress-straining. This index can be determined by using plastic work which has advantages for the condition of cyclic loadings. Then by using this index to determine the position of the critical state line (CSL), the influences of particle crushing on mechanical behavior can be estimated comparing the position of CSL with the current stress state. All the proposed constitutive equations relating to the modified relative breakage index can be directly applied to developing constitutive models under both monotonic and cyclic loadings.
- sand /
- particle crushing /
- grain size distribution /
- plastic work /
- critical state line /
- cyclic loading

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参考文献(56)

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考虑颗粒破碎效应的粒状材料本构研究：进展及发展 English Version

作者简介: 尹振宇(1975- )，男，浙江瑞安人，博士，研究员，博士生导师，主要从事土体本构关系的建立及应用方面的研究与教学工作。E-mail: zhenyu.yin@gmail.com。

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出版历程

Constitutive relations for granular materials considering particle crushing:review and development

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出版历程

目录

作者简介:
尹振宇(1975- )，男，浙江瑞安人，博士，研究员，博士生导师，主要从事土体本构关系的建立及应用方面的研究与教学工作。E-mail: zhenyu.yin@gmail.com。