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Article: Micro-mechanical perspective on the role of particle shape in shearing of sands

TitleMicro-mechanical perspective on the role of particle shape in shearing of sands
Authors
Issue Date1-Oct-2023
PublisherCanadian Science Publishing
Citation
Canadian Geotechnical Journal, 2023, v. 60 How to Cite?
Abstract

This study presents a micro-mechanical perspective on the role of realistic particle shapes in shearing of sands through calibration with physical experiments and parametric studies using discrete element method (DEM) to reveal the different mechanics between irregular particles and spherical particles incorporating rolling resistance (μr). To achieve this goal, particle shapes of Toyoura sand were captured by micro-computed tomography and reconstructed using a clump generation algorithm in DEM. The use of clumps in DEM led to closer match with experimental results of triaxial tests at various porosities and confining pressures, which could not be achieved by sphere models with μr. With realistic particle shapes, initial rotations of clumps were allowed until they became interlocked, while the load resistance built up gradually. High coordination numbers were observed, with force chains relatively evenly distributed. In contrast, the use of μr in sphere models promoted the formation of voids that were sustained during the loading process, because rotational motions of particles were hampered by μr and they did not easily collapse into the voids. This was accompanied by polarised strong force network around the voids, leading to more dilative and brittle macroscopic behaviour than observed in physical experiments. These findings illustrate that particle shapes cannot be sufficiently replaced by the use of sphere models and μr due to intrinsic differences in their micro-mechanics.


Persistent Identifierhttp://hdl.handle.net/10722/340491
ISSN
2023 Impact Factor: 3.0
2023 SCImago Journal Rankings: 1.513

 

DC FieldValueLanguage
dc.contributor.authorHuo, YX-
dc.contributor.authorLeung, YF-
dc.contributor.authorKwok, CY-
dc.date.accessioned2024-03-11T10:45:02Z-
dc.date.available2024-03-11T10:45:02Z-
dc.date.issued2023-10-01-
dc.identifier.citationCanadian Geotechnical Journal, 2023, v. 60-
dc.identifier.issn0008-3674-
dc.identifier.urihttp://hdl.handle.net/10722/340491-
dc.description.abstract<p>This study presents a micro-mechanical perspective on the role of realistic particle shapes in shearing of sands through calibration with physical experiments and parametric studies using discrete element method (DEM) to reveal the different mechanics between irregular particles and spherical particles incorporating rolling resistance (μ<sub>r</sub>). To achieve this goal, particle shapes of Toyoura sand were captured by micro-computed tomography and reconstructed using a clump generation algorithm in DEM. The use of clumps in DEM led to closer match with experimental results of triaxial tests at various porosities and confining pressures, which could not be achieved by sphere models with μ<sub>r</sub>. With realistic particle shapes, initial rotations of clumps were allowed until they became interlocked, while the load resistance built up gradually. High coordination numbers were observed, with force chains relatively evenly distributed. In contrast, the use of μ<sub>r</sub> in sphere models promoted the formation of voids that were sustained during the loading process, because rotational motions of particles were hampered by μ<sub>r</sub> and they did not easily collapse into the voids. This was accompanied by polarised strong force network around the voids, leading to more dilative and brittle macroscopic behaviour than observed in physical experiments. These findings illustrate that particle shapes cannot be sufficiently replaced by the use of sphere models and μ<sub>r</sub> due to intrinsic differences in their micro-mechanics.<br></p>-
dc.languageeng-
dc.publisherCanadian Science Publishing-
dc.relation.ispartofCanadian Geotechnical Journal-
dc.titleMicro-mechanical perspective on the role of particle shape in shearing of sands-
dc.typeArticle-
dc.identifier.doi10.1139/cgj-2022-0270-
dc.identifier.volume60-
dc.identifier.eissn1208-6010-
dc.identifier.issnl0008-3674-

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