Non-Linear Behaviour of Geomaterials in Railway Tracks under Different Loading Conditions

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2016

Autores

Paixao, A (Autor) FEUP; Varandas, JN (Autor) Outra; Fortunato, E (Autor) Outra; Rui Calçada (Autor) FEUP

Ata de Conferência Internacional

Título: ADVANCES IN TRANSPORTATION GEOTECHNICS III

Páginas: 1128-1135

3rd International Conference on Transportation Geotechnics (ICTG)

Guimaraes, PORTUGAL, SEP, 2016

Indexação

ISI Web of Knowledge - 15 Citações

Scopus - 0 Citações

Outras Informações

ID Authenticus: P-00K-QQS

DOI: 10.1016/j.proeng.2016.06.147

Abstract (EN): The resilient behaviour of the geomaterials used in railway tracks, particularly the ballast layer, is mostly non-linear and depends mainly on the loading stress path. However geomaterials are frequently considered as linear elastic in structural analyses, assuming that it somewhat reproduces the results of non-linear models for a given load amplitude. This study focuses on whether this consideration is adequate to simulate not only the overall track behaviour, but also the response of the ballast layer, considering different loading conditions. The authors used three-dimensional train-track-soil system models, validated with experimental data, and the results of linear-elastic models are compared against non-linear models. Although the linear elastic models required significantly lower computational effort and can provide accurate estimates of the overall track response, they strongly underestimate the stress levels inside the ballast layer. This aspect can be an important hindrance to studies using linearelastic models to analyse resilient and plastic deformations of the ballast layer in railway tracks.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8