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A Numerical Study on the Permanent Deformation of Gap-Graded Granular Mixtures
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.ORCID iD: 0000-0001-9091-8963
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Highway Engineering Laboratory.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.ORCID iD: 0000-0002-1526-9331
2016 (English)In: Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance / [ed] J. Pombo, Stirlingshire, UK: Civil-Comp Press , 2016Conference paper (Refereed)
Abstract [en]

Permanent deformation accumulation of unbound granular layers under traffic plays a critical role in the performance and need for maintenance of pavements and railway structures. In this paper, the discrete element method is used to study the permanent strain behaviour of binary mixtures of elastic spheres, as an idealization of gap-graded mixtures, under triaxial monotonic loading. The effects of stress level and soil fabric structure, based on a recently proposed classification system founded on micromechanical considerations, are assessed by subjecting mixtures with varying fines contents to different stress levels. Additionally, mixtures are loaded to static failure to study the dependency of the permanent strains on the closeness of the applied stress to failure stress, in accordance with existing empirical models. Numerical results are also compared with the experimentally determined behaviour of granular materials. The findings indicate that numerical mixtures are able to reproduce some of the most significant features observed in laboratory tests on granular materials, further encouraging the use of numerical simulations to enhance the understanding of granular media behaviour. Additionally, a good correlation between fabric structure and performance is obtained, giving additional support to the use of the studied fabric classification system for performance characterization.

Place, publisher, year, edition, pages
Stirlingshire, UK: Civil-Comp Press , 2016.
Series
, Civil-Comp Proceedings, ISSN 1759-3433
Keyword [en]
granular mixtures, permanent deformation, discrete element method, fabric of soils, static strength
National Category
Geotechnical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-185172DOI: 10.4203/ccp.110.15ScopusID: 2-s2.0-84964355508OAI: oai:DiVA.org:kth-185172DiVA: diva2:918971
Conference
Third International Conference on Railway Technology: Research, Development and Maintenance
Note

QC 20160419

Available from: 2016-04-12 Created: 2016-04-12 Last updated: 2016-04-19Bibliographically approved

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de Frias Lopez, RicardoEkblad, JonasSilfwerbrand, Johan
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