Three-dimensional Distinct Element Analysis of Shear Properties of Unsaturated Soils

Cai, G; Li, J; Xu, Z; He, X; Zhao, C

Three-dimensional Distinct Element Analysis of Shear Properties of Unsaturated Soils

Cai, G Li, J Xu, Z He, X

Zhao, C

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Publication Type:: Journal Article
Citation:: Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering, 2020, 28, (6), pp. 1447-1459
Issue Date:: 2020-12-01

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Field	Value	Language
dc.contributor.author	Cai, G
dc.contributor.author	Li, J
dc.contributor.author	Xu, Z
dc.contributor.author	He, X https://orcid.org/0000-0001-5336-3663
dc.contributor.author	Zhao, C
dc.date.accessioned	2021-05-12T05:06:46Z
dc.date.available	2021-05-12T05:06:46Z
dc.date.issued	2020-12-01
dc.identifier.citation	Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering, 2020, 28, (6), pp. 1447-1459
dc.identifier.issn	1005-0930
dc.identifier.uri	http://hdl.handle.net/10453/148863
dc.description.abstract	Based on the discrete element theory and the existing laboratory experimental results, a method to determine the corresponding relationship between macro parameters and grain-scale parameters of unsaturated soil is proposed, that is, taking the structural yield stress as the intermediate variable, the corresponding relationship between the bond strength and water content between particles is constructed, and a flexible boundary program is compiled and added to PFC3D(particle flow code in three dimensions).Three dimensional discrete element model of unsaturated soil is established in the program of dimensions.The numerical simulation of triaxial consolidation drained shear test of unsaturated soil with different water content is carried out.The internal grain-scale evolution mechanism of macro mechanical properties such as strength, deformation and failure of unsaturated soil is deeply studied.The feasibility of using discrete element method to study unsaturated materials is also discussed.The results show that: with the increase of water content, the smaller the contact force between particles in the sample is, the less the number of soil particles under stress will be, and the earlier the bond failure point will appear.In addition, the change of bond failure number in the shear process can be divided into three stages: slow growth stage, rapid development stage and residual stage. Compared with the laboratory test results of unsaturated soil, the established DEM model and analysis program show good applicability in the aspects of deviatoric stress-strain relationship and strength characteristics.
dc.language	en
dc.relation.ispartof	Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering
dc.relation.isbasedon	10.16058/j.issn.1005-0930.2020.06.016
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	General Science & Technology
dc.title	Three-dimensional Distinct Element Analysis of Shear Properties of Unsaturated Soils
dc.type	Journal Article
utslib.citation.volume	28
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	closed_access	*
dc.date.updated	2021-05-12T05:06:43Z
pubs.issue	6
pubs.publication-status	Published
pubs.volume	28
utslib.citation.issue	6

Abstract:

Based on the discrete element theory and the existing laboratory experimental results, a method to determine the corresponding relationship between macro parameters and grain-scale parameters of unsaturated soil is proposed, that is, taking the structural yield stress as the intermediate variable, the corresponding relationship between the bond strength and water content between particles is constructed, and a flexible boundary program is compiled and added to PFC3D(particle flow code in three dimensions).Three dimensional discrete element model of unsaturated soil is established in the program of dimensions.The numerical simulation of triaxial consolidation drained shear test of unsaturated soil with different water content is carried out.The internal grain-scale evolution mechanism of macro mechanical properties such as strength, deformation and failure of unsaturated soil is deeply studied.The feasibility of using discrete element method to study unsaturated materials is also discussed.The results show that: with the increase of water content, the smaller the contact force between particles in the sample is, the less the number of soil particles under stress will be, and the earlier the bond failure point will appear.In addition, the change of bond failure number in the shear process can be divided into three stages: slow growth stage, rapid development stage and residual stage. Compared with the laboratory test results of unsaturated soil, the established DEM model and analysis program show good applicability in the aspects of deviatoric stress-strain relationship and strength characteristics.

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http://hdl.handle.net/10453/148863