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AuthorThompson, D.J.
AuthorJiang, J.
AuthorToward, M.G.R.
AuthorHussein, M.F.M.
AuthorDijckmans, A.
AuthorCoulier, P.
AuthorDegrande, G.
AuthorLombaert, G.
Available date2015-12-15T06:53:51Z
Publication Date2015-12
Publication NameSoil Dynamics and Earthquake Engineering
ResourceScopus
Identifierhttp://dx.doi.org/10.1016/j.soildyn.2015.09.005
CitationThompson, D.J. et al. "Mitigation of railway-induced vibration by using subgrade stiffening", Soil Dynamics and Earthquake Engineering, Volume 79, Part A, December 2015, Pages 89-103. Available online September 2015.
ISSN0267-7261
URIhttp://hdl.handle.net/10576/3956
AbstractRailway-induced ground vibration is often associated with sites with soft ground. Stiffening of the subgrade beneath the railway track is one particular measure that has potential to reduce the vibration level at such sites. However, the mechanisms behind this reduction are not well understood. Here, the effects are examined in the context of two alternative approaches: (i) subgrade stiffening, where the soil directly under the track is stiffened, and (ii) stiff inclusions introduced at some depth beneath the track, sometimes known as 'wave impeding blocks'. The efficacy of the measures is considered for different ground types in a parametric study carried out using a 2.5D coupled finite-element/boundary-element methodology. The soil is considered to consist of a soft upper layer over a stiffer substratum; corresponding homogeneous grounds are also considered. With a 6. m wide, 1. m thick, concrete block directly under the track, the vibration between 16 and 50. Hz was found to be reduced by between 4 and 10. dB for ground with a 3. m deep soft upper layer. For a deeper soft layer the reductions were greater whereas, for a stiffer ground without the soft upper layer, the reductions in vibration from this block were negligible. Slightly smaller reductions in a similar frequency region were observed when the block was positioned 1. m below the surface, suggesting that, as with stiffening directly under the track, the reduction in vibration was primarily due to the increase of the effective stiffness of the soil beneath the track rather than the effective creation of a new, thinner soil layer. Jet grouting is considered as an alternative to concrete and, although it is found to be less effective due to its comparatively low stiffness, it may still be considered as a practical measure for existing tracks on soft soil sites. The reduction in vibration from this form of soil improvement with a depth of 3. m is similar to that for a 1. m thick concrete block. Finally, results are presented for three example sites with different soil properties which show similar trends.
SponsorEU FP7 project RIVAS (Railway Induced Vibration Abatement Solutions) under Grant Agreement no. 26575. The fifth and sixth authors are post-doctoral fellows of the Research Foundation Flanders (FWO).
Languageen
PublisherElsevier Ltd
Subject2.5D modelling
Finite element/boundary element methods
Ground transmitted vibration
Subgrade stiffening
Wave impeding blocks
TitleMitigation of railway-induced vibration by using subgrade stiffening
TypeArticle
Pagination89-103
Volume Number79
dc.accessType Abstract Only


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