构造模型中 DEM 中织物参数与颗粒材料行为特征的相关性

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Acta Geotechnica Pub Date : 2024-05-11 DOI:10.1007/s11440-024-02333-9
Farid Khayyer, Md Mizanur Rahman, Md Rajibul Karim
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引用次数: 0

摘要

粒状材料的各向异性微观结构对其宏观行为有着深远的影响,可以用织物张量来表征。为了将织物纳入临界状态理论(CST),有人提出了各向异性临界状态理论(ACST),将 CST 的状态参数 ((\psi)\)修改为依赖于织物的膨胀状态参数 ((\upzeta)\)。值得注意的是\(\uppsi\)与宏观行为的特征(如不稳定性、相变和特征状态)有很强的相关性,因此,它已被许多构成模型所采用。虽然\(\upzeta\)有助于将织物纳入 ACST 模型,但\(\upzeta\)与特征特性之间的相关性尚未得到详细评估,尽管有大量关于微观力学和织物的研究。在这项研究中,对排水和非排水三轴进行了大量离散元法模拟,以评估\(\upzeta\)与特征特性之间的相关性。为此,研究了重要特征(如不稳定性、相变和特征状态)中应力比与经典参数和膨胀状态参数(\(\psi\)和\(\upzeta\))之间的相关性。结果发现,使用 \(\upzeta\) 时这种相关性得到了改善,这可能是由于我们的模型中包含了织物。这一观察结果是新的,对于在构造模型中纳入织物演化具有重要意义。
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Correlation of fabric parameters and characteristic features of granular material behaviour in DEM in constitutive modelling

The anisotropic microstructure of granular materials has a profound effect on their macroscopic behaviour and can be characterised using a fabric tensor. To include of fabric in the critical state theory (CST), anisotropic critical state theory (ACST) was proposed by modifying the state parameter \((\psi )\) of CST to a fabric-dependent dilatancy state parameter \((\upzeta )\). Noteworthy that \(\uppsi\) showed a very strong correlation with characteristic features (e.g. instability, phase transformation and characteristic state) of macroscopic behaviour and, as a result, it has been adopted in many constitutive models. While \(\upzeta\) aided the inclusion of fabric in ACST models, the correlation between \(\upzeta\) and characteristic features has not been evaluated in detail yet, although a large number of works are found on micromechanics and fabric only. In this study, a large number of discrete element method simulations for drained and undrained triaxial were conducted to evaluate the correlation between \(\upzeta\) and characteristic features. To this purpose, the correlation between stress ratio and both classic and dilatancy state parameter (\(\psi\) and \(\upzeta\)) were studied in important characteristic features (e.g. instability, phase transformation and characteristic state). It was found that this correlation was improved using \(\upzeta\) which might be due to the inclusion of fabric in our model. This observation is new and significant for inclusion of fabric evolution in constitutive modelling.

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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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