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Geotechnics
Special Issues
Multiscale and Multiphysics Modeling of Sub-Surface Geological Systems (2nd Edition)
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Multiscale and Multiphysics Modeling of Sub-Surface Geological Systems (2nd Edition)

A special issue of Geotechnics (ISSN 2673-7094).

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 1265

Special Issue Editor

Prof. Dr. Yong Sheng

E-Mail Website1 Website2
Guest Editor
School of Computer Science, University of Hull, Hull HU6 7RX, UK
Interests: advanced engineering; structural engineering; material engineering
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The dynamic nature of the sub-surface environment involves a wide variety of processes and is reflective of the constantly changing form of the earth. Some of these processes occur naturally, while others are instigated by human interferences. The versatility of these geological events includes a broad spectrum of activities involving different phases of materials, their individual and collective behaviour within several physical fields, and the disparity of their responses when viewed at varying temporal and spatial scales. In recent decades, significant advances have been made towards understanding and predicting the characteristics of the geological features that have been explored. These achievements have led to advancements in areas such as oil and gas exploitation, groundwater abstraction, geological storage, tunnelling, deep excavations, foundation and basement construction, and the harvest of geothermal energy. However, a great proportion of the geological environment, as well as many aspects of pertinent geological processes, still remain insufficiently investigated. This is particularly the case with respect to multiphysics, multiphase, and multiscale aspects of surface and underground systems, which, in reality, consist of processes that occur simultaneously and are related one way or the other. This Special Issue aims to create awareness of the gap in research in these areas and to intensify the drive for further assessment and reporting of geological systems.

Prof. Dr. Yong Sheng
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Geotechnics is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • geotechnics
  • geomechanics
  • geoenvironment
  • hydrogeology
  • carbon sequestration
  • multiphysics
  • multiphase
  • multiscale
  • soil mechanics
  • rock mechanics

Published Papers (1 paper)

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Research

30 pages, 6898 KiB  
Article
The Sensitivity of Micro—Macro Mechanical Behaviour of Sand to the Inter-Particle Properties
by Ali Momeni, Kenneth Imo-Imo Israel Eshiet and Yong Sheng
Geotechnics 2023, 3(2), 416-445; https://doi.org/10.3390/geotechnics3020024 - 21 May 2023
Viewed by 893
Abstract
Sand is a particulate material but is treated as a continuum solid in some engineering analyses. This approach is proven to be acceptable when dealing with geotechnical structures, provided an adequate factor of safety is applied so that there is no risk of [...] Read more.
Sand is a particulate material but is treated as a continuum solid in some engineering analyses. This approach is proven to be acceptable when dealing with geotechnical structures, provided an adequate factor of safety is applied so that there is no risk of failure. However, the continuum approach does not account for the effect of interparticle forces on the micro–macro behaviour of sand. Sand could be modelled as a particulate material using the discrete element method (DEM), taking into account its discrete nature. This paper shows how the microscopic contact properties between the idealised sand particles influence the macro-mechanical behaviour, highlighting the development of the fabric as the soil approaches failure. Thirty DEM biaxial tests were performed to study the sensitivity of the macro–micro mechanical properties of sand to the inter-particle properties of an idealised sand particle. The conditions of these simulations were the same (e.g., particle size distribution, number of particles, porosity after radius enlargement, boundary conditions, and rate of loading). The sensitivity of the pre-peak, peak, and post-peak behaviour of these simulations to the inter-particle properties of an idealised sand particle was studied. Two extra DEM biaxial tests under different confining pressures were performed to verify the cohesionless nature of the synthetic material used for this study. Since a two-dimensional DEM is used for this study, a detailed approach to interpret the results assuming either a plane strain or a plane stress situation was discussed. This study highlighted the critical inter-particle properties and the range over which these influence macro-mechanical behaviour. The results show that Young’s modulus is mainly dependent on the normal contact stiffness, and peak stress and the angle of internal friction are greatly dependent on the inter-particle coefficient of friction, while Poisson’s ratio and volumetric behaviour of particulate sand are dictated mainly by shear contact stiffness. A set of relationships were established between inter-particle properties and macro-machinal parameters such as Young’s modulus, Poisson’s ratio, and angle of internal friction. The elastoplastic parameters obtained from these tests are qualitatively in agreement with the typical medium and dense sand behaviour. Full article
(This article belongs to the Special Issue Multiscale and Multiphysics Modeling of Sub-Surface Geological Systems (2nd Edition))
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