A numerical framework for modelling settlements of railway ballast layers

Olsson, Erik,1986-KTH,Luleå tekniska universitet,Hållfasthetslära,Department of Solid Mechanics, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden,Luleå Univ Technol, Dept Engn Sci & Math, Luleå, Sweden (författare)

Validerad;2023;Nivå 2;2023-11-27 (hanlid);Full text license: CC BY
QC 20240110
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.

Jelagin, DenisDepartment of Civil and Architectural Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden (författare)
Larsson, StefanKTH,Jord- och bergmekanik,Department of Civil and Architectural Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden(Swepub:kth)u1fgxkpa (författare)
Chen, Feng,1987-KTH,Byggvetenskap,Southeast Univ, Sch Transportat, Dept Highway & Railway Engn, Nanjing, Peoples R China.,Department of Civil and Architectural Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden; Department of Highway and Railway Engineering, School of Transportation, Southeast University, Nanjing, People’s Republic of China(Swepub:kth)u1ng1bl4 (författare)
Elaguine, Denis,Docent,1979-KTH,Byggnadsmaterial(Swepub:kth)u1mpz2x5 (författare)
Luleå tekniska universitetHållfasthetslära (creator_code:org_t)

Av författaren/redakt...: Olsson, Erik, 19 ...; Jelagin, Denis; Larsson, Stefan; Chen, Feng, 1987 ...; Elaguine, Denis, ...

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