Verification of an empirical prediction method for railway induced vibrations by means of numerical simulations

Verbraken, Hans; Lombaert, Geert; Degrande, Geert

doi:10.1016/j.jsv.2010.10.026

Cited by 82 publications

(62 citation statements)

References 19 publications

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“…If these cross terms are omitted in equation (24), the response in the frequency domain is smoothed [26]. A similar smoothing is obtained when the narrow band spectrum of the response in equation (23) is used to compute the power of the signal in one-third octave or octave bands [27,28].…”

Section: Frequency Domain Responsementioning

confidence: 91%

Quantification of uncertainty in the prediction of railway induced ground vibration due to the use of statistical track unevenness data

Lombaert

Galvín

François

et al. 2014

Journal of Sound and Vibration

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Environmental vibrations due to railway traffic are predominantly due to dynamic axle loads caused by wheel and track unevenness and impact excitation by rail joints and wheel flats. Because of its irregular character, track unevenness is commonly processed statistically and represented by its power spectral density function or its root mean square (RMS) value in one-third octave bands. This statistical description does not uniquely define the track unevenness at a given site, however, and different track unevenness profiles matching the statistical description will lead to different predictions of dynamic axle loads and resulting ground vibration. This paper presents a methodology that allows quantifying the corresponding variability in ground vibration predictions. The procedure is derived assuming the geometry of the track and soil to be homogeneous along the track. The procedure is verified by means of Monte Carlo simulations and its usefulness for assessing the mismatch between predicted and measured ground vibration is demonstrated in a case study. The results show that the response in time domain and its narrow band spectrum exhibit significant variability which is reduced when the running RMS value or the one-third octave band spectrum of the response are considered.

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Section: Frequency Domain Responsementioning

confidence: 91%

Quantification of uncertainty in the prediction of railway induced ground vibration due to the use of statistical track unevenness data

Lombaert

Galvín

François

et al. 2014

Journal of Sound and Vibration

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“…A simplified procedure is adopted to compute the insertion loss for a train passage. Previous studies have shown that the stationary part of the free field response is well approximated by assuming the dynamic axle loads to be applied at fixed positions [58]. (table 2):…”

Section: Methodsologymentioning

confidence: 99%

Efficacy of a sheet pile wall as a wave barrier for railway induced ground vibration

Dijckmans

Ekblad

Smekal

et al. 2016

Soil Dynamics and Earthquake Engineering

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This paper investigates the effectiveness of a sheet pile wall to reduce railway induced vibration transmission by means of field measurements and numerical simulations. At Furet, Sweden, a sheet pile wall has been installed in the soil near the track to reduce train induced vibrations in houses close to the track. The depth of the sheet piles is 12 m with every fourth pile extended to 18 m. The efficacy of the wall is determined from in situ measurements of free field vibrations during train passages before and after installation of the sheet pile wall. The field test shows that the sheet pile wall reduces vibrations from 4 Hz upwards. Up till 16 − 20 Hz, the performance generally increases with frequency and typically decreases with increasing distance behind the wall. The performance is further studied by means of two-and-a-half-dimensional coupled finite element -boundary element models. The sheet pile wall is modeled as an orthotropic plate using finite elements, while the soil is modeled as a layered halfspace using boundary elements. The sheet pile wall acts as a stiff wave barrier and the efficacy is determined by the depth and the stiffness contrast with soil. The reduction of vibration levels is entirely due to the relatively high axial stiffness and plate bending stiffness with respect to the horizontal axis of the sheet pile wall; the plate bending stiffness with respect to the vertical axis is too low to affect the transmission of vibrations. Therefore, it is important to take into account the orthotropic behaviour of the sheet pile wall. It is concluded that a sheet pile wall can effectively act as a wave barrier in soft soil conditions provided that the wall is sufficiently deep.

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“…Previous studies have shown that the stationary part of the free field response due to the passage of a train can be well approximated by assuming the dynamic axle loads to be applied at fixed positions, i.e. x k (t) ≈ x k0 [30]. Assuming in addition that the axle loads are incoherent, equation (1) can be simplified and written in the frequency domain as:…”

Section: Methodsologymentioning

confidence: 99%

Mitigation of railway induced ground vibration by heavy masses next to the track

Dijckmans

Coulier

Jiang

et al. 2015

Soil Dynamics and Earthquake Engineering

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The effectiveness of heavy masses next to the track as a measure for the reduction of railway induced ground vibration is investigated by means of numerical simulations. It is assumed that the heavy masses are placed in a continuous row along the track forming a wall. Such a continuous wall could be built as a gabion wall and also used as a noise barrier. Since the performance of mitigation measures on the transmission path strongly depends on local ground conditions, a parametric study is performed for a range of possible designs in a set of different ground types. A two-and-a-half dimensional coupled finite element -boundary element methodology is used, assuming that the geometry of the problem is uniform in the direction along the track. It is found that the heavy masses start to be effective above the mass-spring resonance frequency which is determined by the dynamic stiffness of the soil and the mass of the wall. At frequencies above this resonance frequency, masses at the soil's surface hinder the propagation of surface waves. It is therefore beneficial to make the footprint of the masses as large and stiff as possible. For homogeneous soil conditions, the effectiveness is nearly independent of the distance behind the wall. In the case of a layered soil with a soft top layer, the vibration reduction strongly decreases with increasing distance from the wall.

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Verification of an empirical prediction method for railway induced vibrations by means of numerical simulations

Cited by 82 publications

References 19 publications

Quantification of uncertainty in the prediction of railway induced ground vibration due to the use of statistical track unevenness data

Quantification of uncertainty in the prediction of railway induced ground vibration due to the use of statistical track unevenness data

Efficacy of a sheet pile wall as a wave barrier for railway induced ground vibration

Mitigation of railway induced ground vibration by heavy masses next to the track

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