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A numerical framework for modelling settlements of railway ballast layers
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics, Solid Mechanics. Luleå Univ Technol, Dept Engn Sci & Math, Luleå, Sweden.ORCID iD: 0000-0001-7674-8582
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0002-0596-228X
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.ORCID iD: 0000-0001-9615-4861
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering. Southeast Univ, Sch Transportat, Dept Highway & Railway Engn, Nanjing, Peoples R China..ORCID iD: 0000-0001-9504-2008
2024 (English)In: TRANSPORTATION GEOTECHNICS, ISSN 2214-3912, Vol. 44, article id 101140Article in journal (Refereed) Published
Abstract [en]

Permanent deformation in ballast layers is a major contributing factor to the railway track geometry deterioration. In spite of a considerable amount of research on understanding and predicting performance of ballast layers, accurately capturing their settlements remains a challenge. In order to contribute to solving this important issue, a new numerical method for predicting ballast settlements is presented in this paper. This method is based on the finite element (FE) method combined with a constitutive model that captures permanent deformation accumulation in unbound materials under cyclic loading. This allows predicting permanent deformations of large structures and at large number of load cycles in a computationally efficient manner. The developed constitutive model is validated based on triaxial test measurements over wide range of loading conditions. Stress state in ballast layers has been examined with a 3D FE model, for several embankment structures and traffic load magnitudes. The determined stress distributions and loading frequencies were used as an input of the constitutive model to evaluate permanent strains and settlements of ballast layer. The influence of embankment structural designs and traffic loading magnitudes on the ballast layers settlements is examined and the results obtained are compared with the existing empirical performance models.

Place, publisher, year, edition, pages
Elsevier BV , 2024. Vol. 44, article id 101140
Keywords [en]
Railway embankments, Settlements, Finite elements, Modelling
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-342043DOI: 10.1016/j.trgeo.2023.101140ISI: 001127205100001Scopus ID: 2-s2.0-85183665432OAI: oai:DiVA.org:kth-342043DiVA, id: diva2:1826021
Note

QC 20240110

Available from: 2024-01-10 Created: 2024-01-10 Last updated: 2024-02-08Bibliographically approved

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Olsson, ErikElaguine, DenisLarsson, StefanChen, Feng

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