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Influence of Micro- and Macrostructures on the Behavior and Properties of Geomaterials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Construction and Building Materials".

Deadline for manuscript submissions: closed (20 September 2025) | Viewed by 1413

Special Issue Editors


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Guest Editor
Department of Architecture and Civil Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
Interests: micromechanics of granular media; X-ray microtomography; discrete element modeling (DEM); slope stability; multiscale modeling and simulation of geomaterials; computational geomechanics
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Department of Architecture and Civil Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
Interests: multiscale particle morphology of granular soils; multiscale modeling and simulation of geomaterials; data-driven constitutive modeling of granular materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This issue delves into both classical and emerging perspectives on the micro- and macro-mechanical behaviors of granular materials. Granular materials are ubiquitous in both nature and technology, ranging from sandcastles built on beaches to indispensable computer chips that underpin modern life. In disciplines such as soil mechanics and powder technology, the study of granular materials boasts a long history, with efforts focused on understanding and predicting their complex responses under various loading conditions. With the rapid advancement of optical instruments, imaging technologies, and numerical simulation methods, researchers now have unprecedented tools to explore the mechanics of granular materials, bringing us closer to a more comprehensive understanding.

We welcome researchers to submit their latest discoveries and insights in the form of full-length articles or reviews. Topics of interest include but are not limited to the development and application of novel experimental techniques, the microstructural and micromorphological characterization of geomaterials, the numerical modeling and analysis of fundamental granular behaviors, constitutive modeling of granular materials, data-driven approaches to constitutive modeling, and machine learning-assisted methods in this domain.

We look forward to receiving your contributions.

You may choose our Joint Special Issue in Applied Sciences.

Prof. Dr. Jianfeng Wang
Dr. Wei Xiong
Guest Editors

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Keywords

  • granular materials
  • X-ray microtomography
  • DEM modeling
  • multiscale modeling
  • geomechanics
  • geophysics
  • fabric evolution
  • machine learning
  • constitutive modeling

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Published Papers (1 paper)

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Research

22 pages, 5248 KB  
Article
Experimental and DEM Study on the Mechanical Behaviors of Sand–Fines Mixtures with Different Fines Contents and Particle Size Ratios
by Kejia Wu, Bing Lv, Hexige Baoyin, Dongsheng Li, Zhouyi Yan, Pengqiang Yu and Yang Liu
Materials 2025, 18(21), 4929; https://doi.org/10.3390/ma18214929 - 28 Oct 2025
Cited by 1 | Viewed by 985
Abstract
To clarify the regulatory laws of the fines content (FC) and particle size ratio (SR) on the mechanical properties of sand–fines mixtures and reveal the underlying microscopic mechanical mechanisms, this study takes sand–fines mixtures composed of natural river sand [...] Read more.
To clarify the regulatory laws of the fines content (FC) and particle size ratio (SR) on the mechanical properties of sand–fines mixtures and reveal the underlying microscopic mechanical mechanisms, this study takes sand–fines mixtures composed of natural river sand and silt as the research object. It systematically investigates the macro-mechanical behaviors and micro-interaction mechanisms of the mixtures by combining laboratory triaxial tests and discrete element method (DEM) simulations. First, through conducting triaxial drained shear tests on mixtures with three particle size ratios (SR = 9.1, 18.7, and 39.7) under seven fines contents (FC = 0%, 10%, 20%, 30%, 50%, 70%, and 100%), it is found that both the peak friction angle (φps) and critical-state friction angle (φcs) of sand–fines mixtures show a “first increase, then decrease” trend with the increase in FC. The peak inflection points of their variation curves are the threshold fines content related to SR; meanwhile, a fines content below this threshold has an inhibitory effect on dilatancy, while that above this threshold exerts a promotive effect on dilatancy. Subsequently, by exploring the microscopic contact behaviors of sand–fines mixtures, it is observed that, under the fines content corresponding to the highest peak strength, the strong contact network and weak contact network inside the material form an optimal coordination between efficient load-bearing and stable support. This coordination enables the macro-strength of the mixture to reach the peak at this fines content. In addition, by modifying the weight coefficient of fabric anisotropy, a unique linear relationship between the fabric anisotropy of strong contacts and the stress ratio can be established, confirming that the strong contact network plays a core mechanical role in mixtures with different FC values. Full article
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