The effect of embankment on high speed rail ground vibrations

Olivier, Bryan; Connolly, David; Costa, Pedro Alves; Kouroussis, Georges

doi:10.1080/23248378.2016.1220844

Cited by 52 publications

(20 citation statements)

References 34 publications

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“…(b)) are because the NN approach was trained for a ballasted track over an embankment, while the HST line between Brussels and Köln is an at-grade track. The effect of the embankment is significant at the locations closer to the track [14,52]. Figure 8 shows the effect of a ±10% variation in |Ã g |-values, on the predicted vibration from the scoping model.…”

Section: Experimental Validationmentioning

confidence: 98%

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Scoping assessment of free-field vibrations due to railway traffic

Galvín

Mendoza

Connolly

et al. 2018

Soil Dynamics and Earthquake Engineering

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The number of railway lines both operational and under construction is growing rapidly, leading to an increase in the number of buildings adversely affected by ground-borne vibration (e.g. shaking and indoor noise). Post-construction mitigation measures are expensive, thus driving the need for early stage prediction, during project planning/development phases. To achieve this, scoping models (i.e. desktop studies) are used to assess long stretches of track quickly, in absence of detailed design information. This paper presents a new, highly customisable scoping model, which can analyse the effect of detailed changes to train, track and soil on ground vibration levels. The methodology considers soil stiffness and the combination of both the dynamic and static forces generated due to train passage. It has low computational cost and can predict free-field vibration levels in accordance with the most common international standards. The model uses the direct stiffness method to compute the soil Green's function, and a novel two-and-a-half dimensional (2.5D) finite element strategy for train-track interaction. The soil Green's function is modulated using a neural network (NN) procedure to remove the need for the time consuming computation of track-soil coupling. This modulation factor combined with the new train-track approach results in a large reduction in computational time. The proposed model is validated by comparing track receptance, free-field mobility and soil vibration with both field experiments and a more comprehensive 2.5D combined finite element-boundary element (FEM-BEM) model. A sensitivity analysis is undertaken and it is shown that track type, soil properties and train speed have a dominant effect on ground vibration levels. Finally, the possibility of using average shear wave velocity introduced for seismic site response analysis to predict vibration levels is investigated and shown to be reasonable for certain smooth stratigraphy's.

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Section: Experimental Validationmentioning

confidence: 98%

“…The embankment properties are approximated to be equal to the uppermost soil layer. The effect of the embankment on ground vibrations due to railway traffic has been previously studied by other authors (among them [14,52]).…”

Section: Nn Testingmentioning

confidence: 99%

Scoping assessment of free-field vibrations due to railway traffic

Galvín

Mendoza

Connolly

et al. 2018

Soil Dynamics and Earthquake Engineering

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“…The track material properties are shown in Table 2. The presence of an embankment [56], [57] is ignored because singular defects are more commonly found at-grade in urban areas. The soil supporting the flexible track model is modelled using a coupled lumped mass (CLM) model, in the vertical plane [58].…”

Section: Modelling Approach Overviewmentioning

confidence: 99%

A 2.5D time-frequency domain model for railway induced soil-building vibration due to railway defects

Connolly

Galvín

Olivier

et al. 2019

Soil Dynamics and Earthquake Engineering

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“…The speed at which maximum dynamic amplification occurs is the 'critical velocity' ( [1], [2]). This is undesirable because it is a safety risk, increases track degradation and can induce ground-borne vibration ( [3], [4], [5]).…”

Section: Introductionmentioning

confidence: 99%

Soil Non-Linearity on High Speed Railway Lines

Dong¹,

Costa

Laghrouche

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Increases in operational train speed have resulted in an elevated probability that dynamic effects will occur inside the railway track and subgrade structure. This is problematic because it causes soil non-linearity, thus resulting in reduced soil stiffness. Therefore, this paper outlines a numerical semi-analytical frequency domain model to compute and analyse non-linear stiffness degradation below railway lines. An equivalent linear approach is used to incorporate non-linear stiffness and damping changes into a thin-layer element frequency-wavenumber domain formulation. The model is validated using published data and then used to analyse nonlinearity. It is shown that non-linearity plays an important role in track-ground response, with track displacements increasing significantly in magnitude. It is also shown that the critical velocity can be reduced significantly, which is important because many high speed lines set their dynamic threshold at 70% of the linearly calculated value. Similar findings are made for track velocities and soil strain levels, thus indicating it is vital to consider soil non-linearity when modelling high speed rail track behaviour.

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The effect of embankment on high speed rail ground vibrations

Cited by 52 publications

References 34 publications

Scoping assessment of free-field vibrations due to railway traffic

Scoping assessment of free-field vibrations due to railway traffic

A 2.5D time-frequency domain model for railway induced soil-building vibration due to railway defects

Soil Non-Linearity on High Speed Railway Lines

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