Stress and permanent deformation amplification factors in subgrade induced by dynamic mechanisms in track structures

• Type: Article in International Scientific Journal
• Date: 2021

Authors

A. Ramos (Author) Other; A. Gomes Correia (Author) Other; Rui Calçada (Author) FEUP; Pedro Alves Costa (Author) FEUP

Journal

Title: International Journal of Rail Transportation

Pages: 1-33

ISSN: 2324-8378

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-00T-WND

DOI: 10.1080/23248378.2021.1922317

Abstract (EN): In this paper, the performance of different railway structures - ballasted and two types of slab tracks (Rheda system and a ballastless track only constituted by the concrete slab) - is evaluated in terms of stresses and permanent deformations through the selection of some important parameters: wavelength of the unevenness profile, train's speed, subgrade's characteristics and spatial variability of the track unevenness profile. The elastodynamic response of 60 case studies is computed through a 2.5D model FEM-PML and the long-term behaviour is assessed by the implementation of a permanent deformation model. The obtained results are analysed through innovative stress and permanent deformation amplification factors in the subgrade layer. This study concludes that the train's speed and the mechanical properties of the subgrade are the factors that most affect the long-term performance of the subgrade of railway structures, which must be considered for further optimization of the rail track structures.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 33