织物各向异性对颗粒材料小应变剪切模量的影响

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Xiao-Tian Yang, Yan-Guo Zhou, Qiang Ma, Yun-Min Chen
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引用次数: 0

摘要

粒状土在工程中通常表现出各向异性刚度,但由于缺乏适当的因素和定量研究,在现场和实验室条件下进行量化具有挑战性。本文采用离散元法创建了两种典型的土壤织物,并进行了双向剪切波测量,通过监测微观参数来研究其与宏观刚度各向异性之间的联系。结果表明,随着织物各向异性的增加,参考织物首先增加,然后在 XZ 应力平面上随着进一步增加而减小,而在 XY 应力平面上始终近似线性地减小。参考织构是由波传播方向上的接触密度和微尺度检测下的颗粒扰动决定的。结果还揭示了宏观刚度各向异性与微观织物各向异性之间的线性关系,这可以作为一种有效的方法,通过波测量就地反映各向异性的程度。此外,还讨论了小应变剪切模量表达式的适用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effects of fabric anisotropy on the small-strain shear modulus of granular materials

Effects of fabric anisotropy on the small-strain shear modulus of granular materials

Granular soil generally exhibits an anisotropic stiffness in engineering but challenging to quantify in situ and laboratory condition, due to a lack of the appropriate factor and quantitative research. In this paper, discrete element method is employed to create two typical types of soil fabric and conduct shear wave measurement in double direction, with the microscopic parameters monitored to investigate the connection with macroscopic stiffness anisotropy. The results show that the reference fabric increases as fabric anisotropy increases first and then decreases with further increase in the XZ stress plane, while always decreases approximately linearly in the XY stress plane. The reference fabric is determined by the contact density in the direction of wave propagation and particle perturbation under microscale examination. The results also reveal a linear relationship between the macroscopic stiffness anisotropy and microscopic fabric anisotropy, which could be used as an effective method to reflect the degree of anisotropy in situ by wave measurement. And the applicability of the expression of small-strain shear modulus is also discussed.

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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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