论文信息 - DESIGN AND PERFORMANCE OF A STIFF WAVE BARRIER IN THE SOIL CONCEPTION ET PERFORMANCE D'UNE BARRIERE D'ONDES RAIDE DANS LE SOL

DESIGN AND PERFORMANCE OF A STIFF WAVE BARRIER IN THE SOIL CONCEPTION ET PERFORMANCE D'UNE BARRIERE D'ONDES RAIDE DANS LE SOL

This paper investigates the effectiveness of a stiff wave barrier in the soil as an efficient measure for the mitigation of railway induced vibrations. Numerical calculations demonstrate that such a barrier can be very effective, provided that the stiffness contrast between the barrier and the surrounding soil is sufficiently large. Findings from the numerical studies are verified by means of a field test in Spain, where a continuous barrier has been created close to an existing railway track using overlapping jet grout columns. Measurements of train passages before and after installation of the barrier are compared in order to assess the barrier's vibration reduction efficiency. It is shown that the jet grouting wall is very effective: immediately behind the wall, insertion loss values of about 5 dB are already obtained from 8 Hz on, with a peak of about 12 dB at 25 Hz. The barrier's ability to solve low frequency vibration problems is a unique feature compared to most other vibration mitigation measures for existing railway lines.

[1] Hem Hunt,et al. A Generic Model for Evaluating the Performance of Base-Isolated Buildings , 2003 .

[2] G. Lombaert,et al. Subgrade stiffening next to the track as a wave impeding barrier for railway induced vibrations , 2013 .

[3] Anders Karlström,et al. Efficiency of trenches along railways for trains moving at sub-or supersonic speeds , 2007 .

[4] R. Woods. SCREENING OF SURFACE WAVES IN SOILS , 1968 .

[5] X Sheng,et al. Modelling ground vibration from railways using wavenumber finite- and boundary-element methods , 2005, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[6] Søren Nielsen,et al. Reduction of ground vibration by means of barriers or soil improvement along a railway track , 2005 .

[7] Geert Lombaert,et al. The control of ground-borne vibrations from railway traffic by means of continuous floating slabs , 2006 .

[8] Mohammed F.M. Hussein,et al. Vibration from railways: can we achieve better than +/-10dB prediction accuracy? , 2007 .

[9] A. Kaynia,et al. Ground vibration from high-speed trains: Prediction and countermeasure , 2000 .

[10] G. Lombaert,et al. A 2.5D coupled FE-BE methodology for the dynamic interaction between longitudinally invariant structures and a layered halfspace , 2010 .