NEWS

RIVAS – Vibrations: Ways out of the Annoyance

A summary of outcomes

Please find the final brochure of the RIVAS project under Results and Publications.


The RIVAS FINAL CONFERENCE

“Vibration – Ways out of the annoyance”, was held in Brussels, on 21 November 2013

Please find here more information.

 

Mitigation Measures Transmission/Propagation (WP4)

The main objective of this work package is to develop and to optimise railway infrastructure based vibration reduction technologies in the transmission path, either under or next to the track. In the frequency range of railway vibration, the top layer of soil plays an important role which is often neglected. It leads to a ‘cut-on frequency’ above which a steep rise in the vibration trans-mission spectrum occurs. In these studies, a key approach is therefore to take the layered ground structure into account or alter its effect to form barriers to propagation.

In particular the work package has the following objectives:

  • Mitigation technologies in the vibration transmission path will be developed and tested. These will be placed close to the track so that they are still regarded as part of the railway infrastructure. The work will concentrate on ballasted track.
  • Options that will be studied are: subgrade stiffening, trenches, structural barriers (buried walls), horizontally-layered wave impeding blocks (WIBs) and resonant reflectors.
  • These options will be studied theoretically in a parametric study for a range of possible de-signs in a set of different ground types to establish the circumstances in which they might be efficient and lead to particular insertion losses.
  • At least two vibration mitigation technologies on or close to existing railway lines will be tested in the project and their effective reduction will be measured in field tests.
  • Each successful option will be costed with design guidelines and engineering constraints stated to form a ‘technology assessment’ of the technique


The overall deliverable of the WP will be a set of guidelines on the possible effectiveness of each of the mitigation measures studied in different sites. The guidelines will contain information on engineering design constraints, costs and other factors to form a ‘technology assessment’ of each mitigation method