Investigation of Vibration Mitigation by Concrete Trough with Integrated Under Ballast Mats for Surface-Railways

Garburg, R.; Frank, Christian; Mistler, Michael

doi:10.1007/978-3-030-70289-2_61

Cited by 2 publications

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“…In addition, a reduction of about 10 dB can be found at higher frequencies for the Sinzheim and Baden measurement sites where soft under ballast mats (k M ′′ ≈ 0.06 N/mm 3 ) have been used. The average reduction effect for all troughs, trains and sites, which is shown in Figure 11 (square markers [24]), is less strong and less specific for the low-frequency reduction. On the other hand, the first measurements at the Sinzheim trough (Figure 11, circle markers [25]) resulted in a stronger and wider reduction, as well as measurements at an under-ballast plate in Graz (Figure 11, triangle markers [26]).…”

Section: Measurements Related To Under-ballast Plates and Troughsmentioning

confidence: 92%

“…The same mitigation principle has been used for several solutions with concrete troughs which are often combined with under-ballast mats. The measurement results from [24] are further analysed for the reduction effect at different sites, for different trains and different train speeds. Figure 10 shows the ground vibrations at 8 m distance with and without concrete trough.…”

Section: Measurements Related To Under-ballast Plates and Troughsmentioning

confidence: 99%

“…The original spectra for the isolated and un-isolated track should be reported for to check if the established reduction is for the main amplitudes or for smaller and more random amplitudes (see Figures 4, 5 and 8-10). □ average of 6 different sites, with soil correction [24], at Sinzheim, after installation [25], △ an urban track in Graz [26].…”

Section: Interpretation and Recommendations For The Measurement Of Mi...mentioning

confidence: 99%

“…Measured ground vibration reduction of tracks with concrete troughs. ☐ average of 6 different sites, with soil correction[24], ◯ at Sinzheim, after installation[25], △ an urban track in Graz[26].…”

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confidence: 99%

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Mitigation of Railway-Induced Ground Vibration by Soft Support Elements and a Higher Bending Stiffness of the Track

Auersch

2024

Applied Sciences

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The mitigation of train-induced ground vibrations by track solutions is investigated by calculations and measurements. The calculation by a wavenumber domain method includes the correct vehicle–track interaction and the correct track–soil interaction. Some theoretical results for elastic elements and an increased bending stiffness of the track are presented where the force transfer of the track and the vehicle–track interaction are calculated for the high-frequency dynamic mitigation, and the force distribution along the track is calculated for the low-frequency mitigation which is due to the smoother impulses from the passing static loads. Measurement results for the ground vibration near isolated and un-isolated tracks are given for several under-sleeper pads, for under-ballast mats, and for several under-ballast plates and ballast troughs. The elastic elements yield a resonance frequency of the vehicle–track–soil system and a high-frequency reduction of the dynamic axle loads which depends mainly on the softness of the pads or mats and which can be improved by a higher sleeper mass. In addition, all troughs and most of the soft elements show a low-frequency reduction which is attributed to the scattered impulses of the static axle loads. Besides this main contribution of the article, the problem of a soft reference section on a different soil is discussed and recommendations for better ground vibration measurements of mitigation effects are given.

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Section: Measurements Related To Under-ballast Plates and Troughsmentioning

confidence: 92%

Section: Measurements Related To Under-ballast Plates and Troughsmentioning

confidence: 99%

Section: Interpretation and Recommendations For The Measurement Of Mi...mentioning

confidence: 99%

mentioning

confidence: 99%

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Mitigation of Railway-Induced Ground Vibration by Soft Support Elements and a Higher Bending Stiffness of the Track

Auersch

2024

Applied Sciences

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“…It has been found that this component is shifted in frequency when the train speed is increased [9,10], but the increase of amplitudes can be from constant to strongly increasing [7]. Sometimes, the reduction of this component by a ballast-plate track [6], a trough with under ballast mat [11], a slab track [12] or a tunnel track could be observed. The purpose of the present work is to find the reason of this component and to compare it with other effects of a varying stiffness or a moving static load.…”

Section: Introductionmentioning

confidence: 99%

Effects of a varying track and soil stiffness on ground vibrations near railway lines

Auersch¹

Civil-Comp Conferences

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Usually, geometric irregularities are considered as the main cause of ground vibrations from trains. A varying stiffness of the track, the track support and the soil can also generate ground vibrations. The regular stiffness variation of the track on and between the sleepers results in a deterministic dynamic axle load. The random stiffness variation of the track support yields also dynamic axle loads which are generated by the acceleration of the unsprung mass (from the varying wheel displacements under the static axle load). The random stiffness variation has a second effect. The pulses from the passage of the static axle loads are superposed regularly to the quasi-static response, but also irregularly to yield a "scattered" part of the axle pulses. The same holds for a random variation of the soil stiffness. All these effects of stiffness variations have been calculated by wavenumber-domain multi-beam track models, a random finite-element soil model and the superposition of axle impulses in a stochastic simulation. The results are confronted with many measurements at different sites. It is concluded that the stiffness variation of the track and the soil generate an important ground vibration component near railway lines.

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Investigation of Vibration Mitigation by Concrete Trough with Integrated Under Ballast Mats for Surface-Railways

Cited by 2 publications

References 1 publication

Mitigation of Railway-Induced Ground Vibration by Soft Support Elements and a Higher Bending Stiffness of the Track

Mitigation of Railway-Induced Ground Vibration by Soft Support Elements and a Higher Bending Stiffness of the Track

Effects of a varying track and soil stiffness on ground vibrations near railway lines

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