De Bold, Robert

Forde, Michael

Ho, Carlton

Zimele, Lelde

Substantial investments in high-speed railway lines have led to an increase in train speeds. A major problem of this is the generation of excessive ground vibrations, predominantly caused by surface or Rayleigh waves, which contribute to approximately two thirds of the total wave energy. Yet there is no simplistic modelling data presentation available. This work therefore aims to find a relationship between normalised maximum dynamic displacement (with respect to maximum static displacement) and normalised train speed (with respect to the Rayleigh wave velocity) for both ballasted and slab tracks.2-D models of the problem were constructed using the finite element methodand Abaqus software. Static and dynamic analyses were then performed on different track configurations and a range of subsoil parameters. The variation of maximum dynamic displacements further afield was explored for 15 train speeds, and the results compared with the experimental field data from three European train lines: Ledsgaard (Sweden), Amsterdam-Utrecht (The Netherlands) and Stilton Fen (UK).The modelling results slightly overestimated the maximum dynamic displacement values; hence, mean calibration factors and additional,more precise material properties were proposed to fit the field data. It was concluded that the slab track does not amplify the maximum dynamic displacements to the same extent as the ballasted track. It was found that substituting the ballasted track on an embankment with concrete slab track would reduce the maximum dynamic displacement at the maximum allowable train speed (typically 0.7 x Rayleigh wave velocity) by approximately 30

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EVALUATING THE DYNAMIC BEHAVIOUR OF CONCRETE SLAB TRACK FOR HIGH SPEED RAIL USING NUMERICAL ANALYSIS

https://www.pure.ed.ac.uk/ws/files/57255869/doi_0131_submitter_0001_MCF.pdf

EVALUATING THE DYNAMIC BEHAVIOUR OF CONCRETE SLAB TRACK FOR HIGH SPEED RAIL USING NUMERICAL ANALYSIS

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