Wang, JP, Zeng, GH and Yu, HS orcid.org/0000-0003-3330-1531 (2019) A DEM investigation of water-bridged granular materials at the critical state. Computational Particle Mechanics, 6 (4). pp. 637-655. ISSN 2196-4378
Abstract
The critical state is an important concept for saturated and partially saturated granular materials as the strength and volume become constant and unique under continuous shear. By incorporating the water bridge effect, the mechanical behaviours of wet granular matters can be studied by the discrete element method (DEM). A series of DEM simulations are performed following the conventional triaxial loading path for dry and wet granular materials, and different suction values are applied at various confining stress levels. Unique critical state behaviours have been observed in both macroscopic and microscopic scales. It shows that the confining stress level plays an important role in the critical state behaviour of wet granular materials. The critical stress ratio for a wet material is not a constant value at different stress levels, and it is found that both the critical stress ratio and void ratio in wet granular matters are also much higher with a low confining stress. A framework is proposed by considering both the contact stress and the capillary stress effects to model the critical state lines. At large strain, the coordination number, the mean inter-particle force and fabric anisotropies evolve to constant critical state values for both dry and wet materials. The macro-parameters formulating the critical state stress ratio are found to be associated with the critical state anisotropies in solid skeleton and water phase fabrics, respectively.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © OWZ 2019. This is an author produced version of an article published in Computational Particle Mechanics. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Wet granular material; Critical state; Micromechanics; Discrete element modelling |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 26 Jun 2019 10:52 |
Last Modified: | 18 May 2020 00:40 |
Status: | Published |
Publisher: | Springer |
Identification Number: | 10.1007/s40571-019-00243-2 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:147683 |