Avvattningens påverkan på spårläget

• Main Author: Asplund, Anette
• Format: Others
• Language: Swedish
• Published: Luleå tekniska universitet, Mining and Geotechnical Engineering - Swedish Blasting Research Centre 2017
• Subjects: Avvattning; Engineering and Technology; Teknik och teknologier
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62505

The aim of this work is to investigate the relationship between the dewatering measures and the condition of the track quality and whether dewatering affect the degradation rate of the track. The goal is to find out if the dewatering of the substructure gives a better track quality condition and a slower track degradation. The literature study performed in this work shows that there is no research done that demonstrates the relationship between dewatering and track quality degradation. This work comprise a case study of railway lines where dewatering has been performed compared to sections with the same properties were dewatering was not performed. The work is limited to the track section 113 and 124, and to investigation of the height deviation of the track. The Swedish Transport Administration, Trafikverket, has made data available from the database OPTRAM which is used in the analysis. Three different wave length were analysed; short-wave (1-25 m), medium-wave (25-70 m) and long-wave (70-150 m). This is a quantitative study limited to literary studies, data collection, data quality assessment and data analysis. The results have been analysed by means of literature studies including newly published results from this field. The dewatering measures gives following effects in the studied wavelengths: The dewatering impact on the track quality in all wavelengths. The dewatering initially impairs track quality in the short-wave which may be caused due to settlements in the substructure. The track quality in the medium-wave show an improvement of the track quality, which are statistical confidentially. The track quality in the long-wave show a marginal changes after the dewatering. The degradation rate of the track quality for the medium-wave will be lower after dewatering, which applies to both the time and tonnage domain. To compensate the change in the track quality after dewatering for the short-wave the recommendation is to tamp the track after dewatering. This study shows that dewatering of the substructure followed by tamping is a good maintenance action to improve the track quality in the long-time run. Today Trafikverket primarily use the short-wave to initiate the maintenance activity tamping, however it is a point to look more even on the medium-wave to get a more holistic view of the track quality and its degradation. Further work could be to analyse more number of sections that had have problems with track quality and were no tamping is done before dewatering but could have been done in combination with dewatering. Tamping can have been performed after one or a couple of year after dewatering. Moreover, further work could be to develop a cost model for dewatering in a lifecycle perspective.