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Benämning

Quantifying complex track stiffness response

Utförare

Chalmers tekniska högskola

Beskrivning

(Original title HHJV Övergångszoner förändring av styvhet på kort sträcka.)
New Title Effect of transition zones on high-speed Railways

In most (high-speed, HS) line infrastructure, very strict alignment and stiffness variations are prescribed. These perhaps result in overly costly track configurations being pre-scribed to prevent additional maintenance issues resulting from track degradation down the line. At present the complete system of railway head, sleepers, subgrade (slab), embankment and subsoil are not considered in setting these guide lines. Something that will be addressed in this project.
Trafikverket requires adequate design guidelines for regular and HS railway systems that ensure trouble free low maintenance operation of their track with smooth transitions, that incorporate short term dynamic loading considerations (e.g. vibrations from a single bogie) and accumulated effects over long-term loading (e.g. 60 yrs. operational life). The main issue is to establish the bounds of permissible stiffness distributions along & below the track, this includes track alignment, during its life-time that minimises construction and maintenance costs. Here, ‘stiffness’ refers to the evolving track-subgrade-soil system. The project aims to use a combination of quasi-static and dynamic numerical analyses to establish a generalised guideline, in terms of a maximum allowable variation in track compliance (rather than alignment alone), to fulfil the operational needs of a railway track.

Genomförandeperiod

den 15 augusti 2017 till den 15 februari 2021

Publicerade resultat

Viscoplastic cyclic degradation model for soft natural soils
Dynamic response of a transition zone on

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Målområde

Ökad produktivitet och innovation