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

• Type: Article in International Conference Proceedings Book
• Date: 2016

Authors

Paixao, A (Author) FEUP; Varandas, JN (Author) Other; Fortunato, E (Author) Other; Rui Calçada (Author) FEUP

Conference proceedings International

Title: ADVANCES IN TRANSPORTATION GEOTECHNICS III

Pages: 1128-1135

3rd International Conference on Transportation Geotechnics (ICTG)

Guimaraes, PORTUGAL, SEP, 2016

Indexing

ISI Web of Knowledge - 15 Citations

Scopus - 0 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8