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Keywords: freight railway lines, rehabilitation of old lines, sustainable transportation, geotechnical characterisation, experimental field works, non-destructive testing, ground penetrating radar, numerical modelling.

Summary

After railway transportation suffered a sharp decline, lately the rehabilitation of old railway lines has been implemented in many countries. Several of these cases concern lines that are expected to be used for freight transport. Whenever possible, during rehabilitation of railway tracks there are technical, economic and environmental advantages in reusing existing materials, particularly the fouled ballast layer (ballast contaminated by fines), to support new reinforcement layers.

This paper presents results of studies with the aim of rehabilitating a railway freight corridor, located in Africa. The visual inspection performed throughout the line, the analysis of the characteristics of the existing superstructure and the substructure survey made it possible to identify the thickness of the layers, soils characteristics and to evaluate the stiffness of the track bed.

An experimental study was carried out in a deactivated rail stretch in order to assess the feasibility of different track structural configurations. In this study costs and construction processes were considered. Results of ground penetrating radar surveys, plate load tests and falling weight deflectometer tests performed on the experimental site are also presented in this paper.

A numerical modelling analysis of the different structural configurations that were tested in the experimental site is also presented. Stress and deformation results are analysed and compared.

The results obtained in the studies showed that it is possible to carry out efficiently structural reinforcement of the platform, taking into account economic and technical issues.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 110 PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 227 Geotechnical Aspects of the Rehabilitation of a Freight Railway Line in Africa E. Fortunato¹, S. Fontul¹, A. Paixão¹, N. Cruz², J. Cruz² and F. Asseiceiro³ ¹Transportation Department, National Laboratory for Civil Engineering, Lisbon, Portugal ²Direção de Fundações e Geotecnia, Mota-Engil Engenharia e Construção, Vila Nova de Gaia, Portugal ³Ferrovias, Mota-Engil Engenharia e Construção, Linda-a-Velha, Portugal doi:10.4203/ccp.110.227 purchase the full-text of this paper Full Bibliographic Reference for this paper , "Geotechnical Aspects of the Rehabilitation of a Freight Railway Line in Africa", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 227, 2016. doi:10.4203/ccp.110.227 Keywords: freight railway lines, rehabilitation of old lines, sustainable transportation, geotechnical characterisation, experimental field works, non-destructive testing, ground penetrating radar, numerical modelling. Summary After railway transportation suffered a sharp decline, lately the rehabilitation of old railway lines has been implemented in many countries. Several of these cases concern lines that are expected to be used for freight transport. Whenever possible, during rehabilitation of railway tracks there are technical, economic and environmental advantages in reusing existing materials, particularly the fouled ballast layer (ballast contaminated by fines), to support new reinforcement layers. This paper presents results of studies with the aim of rehabilitating a railway freight corridor, located in Africa. The visual inspection performed throughout the line, the analysis of the characteristics of the existing superstructure and the substructure survey made it possible to identify the thickness of the layers, soils characteristics and to evaluate the stiffness of the track bed. An experimental study was carried out in a deactivated rail stretch in order to assess the feasibility of different track structural configurations. In this study costs and construction processes were considered. Results of ground penetrating radar surveys, plate load tests and falling weight deflectometer tests performed on the experimental site are also presented in this paper. A numerical modelling analysis of the different structural configurations that were tested in the experimental site is also presented. Stress and deformation results are analysed and compared. The results obtained in the studies showed that it is possible to carry out efficiently structural reinforcement of the platform, taking into account economic and technical issues. purchase the full-text of this paper (price £22) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £85 +P&P)
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