Design and construction of backfills for railway track transition zones
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://repositorio.lnec.pt:8080/jspui/handle/123456789/1005601 |
Resumo: | The initial geometry of a railway track continually degrades over its life-cycle. Changes in the track alignment give rise to variations in the dynamic axle load which accelerate track degradation, with consequences for maintenance and avail- ability of the line. This behaviour is particularly evident at some critical locations that are associated with abrupt changes in the track’s vertical stiffness, such as transitions to bridges or other structures. In order to mitigate this problem, careful design and construction is required, for which several recommendations have been suggested in the literature. However, studies based on the maintenance records of existing high-speed lines have shown that the problem of track degradation associated with stiffness variations is far from being solved. This paper presents a short review on the design of transition zones. A case study on the design and construction of a transition zone on a new Portuguese railway line is analysed. Results of conventional laboratory and cyclic load triaxial testing on granular materials and in situ mechanical characterization of the layers are presented. Relevant aspects regarding the construction are addressed and discussed. The results obtained at the substructure level seem to indicate that the design of the transition zone was successful in minimizing settlement and achieving a gradual stiffness increase as a bridge is approached. |
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Design and construction of backfills for railway track transition zonesRailway transition zonesBackfill design and constructionVertical stiffnessTrack degradationCyclic load triaxial testsDeformation modulusPerformance-based testsThe initial geometry of a railway track continually degrades over its life-cycle. Changes in the track alignment give rise to variations in the dynamic axle load which accelerate track degradation, with consequences for maintenance and avail- ability of the line. This behaviour is particularly evident at some critical locations that are associated with abrupt changes in the track’s vertical stiffness, such as transitions to bridges or other structures. In order to mitigate this problem, careful design and construction is required, for which several recommendations have been suggested in the literature. However, studies based on the maintenance records of existing high-speed lines have shown that the problem of track degradation associated with stiffness variations is far from being solved. This paper presents a short review on the design of transition zones. A case study on the design and construction of a transition zone on a new Portuguese railway line is analysed. Results of conventional laboratory and cyclic load triaxial testing on granular materials and in situ mechanical characterization of the layers are presented. Relevant aspects regarding the construction are addressed and discussed. The results obtained at the substructure level seem to indicate that the design of the transition zone was successful in minimizing settlement and achieving a gradual stiffness increase as a bridge is approached.SAGE Publications on behalf of IMechE2013-12-26T09:20:57Z2014-10-21T08:49:17Z2017-04-13T09:04:05Z2015-01-01T00:00:00Z2015-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://repositorio.lnec.pt:8080/jspui/handle/123456789/1005601eng2041-3017doi: 10.1177/0954409713499016Paixão, A.Fortunato, E.Calçada, R.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-13T03:04:08Zoai:localhost:123456789/1005601Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:39:09.842885Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Design and construction of backfills for railway track transition zones |
title |
Design and construction of backfills for railway track transition zones |
spellingShingle |
Design and construction of backfills for railway track transition zones Paixão, A. Railway transition zones Backfill design and construction Vertical stiffness Track degradation Cyclic load triaxial tests Deformation modulus Performance-based tests |
title_short |
Design and construction of backfills for railway track transition zones |
title_full |
Design and construction of backfills for railway track transition zones |
title_fullStr |
Design and construction of backfills for railway track transition zones |
title_full_unstemmed |
Design and construction of backfills for railway track transition zones |
title_sort |
Design and construction of backfills for railway track transition zones |
author |
Paixão, A. |
author_facet |
Paixão, A. Fortunato, E. Calçada, R. |
author_role |
author |
author2 |
Fortunato, E. Calçada, R. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Paixão, A. Fortunato, E. Calçada, R. |
dc.subject.por.fl_str_mv |
Railway transition zones Backfill design and construction Vertical stiffness Track degradation Cyclic load triaxial tests Deformation modulus Performance-based tests |
topic |
Railway transition zones Backfill design and construction Vertical stiffness Track degradation Cyclic load triaxial tests Deformation modulus Performance-based tests |
description |
The initial geometry of a railway track continually degrades over its life-cycle. Changes in the track alignment give rise to variations in the dynamic axle load which accelerate track degradation, with consequences for maintenance and avail- ability of the line. This behaviour is particularly evident at some critical locations that are associated with abrupt changes in the track’s vertical stiffness, such as transitions to bridges or other structures. In order to mitigate this problem, careful design and construction is required, for which several recommendations have been suggested in the literature. However, studies based on the maintenance records of existing high-speed lines have shown that the problem of track degradation associated with stiffness variations is far from being solved. This paper presents a short review on the design of transition zones. A case study on the design and construction of a transition zone on a new Portuguese railway line is analysed. Results of conventional laboratory and cyclic load triaxial testing on granular materials and in situ mechanical characterization of the layers are presented. Relevant aspects regarding the construction are addressed and discussed. The results obtained at the substructure level seem to indicate that the design of the transition zone was successful in minimizing settlement and achieving a gradual stiffness increase as a bridge is approached. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-12-26T09:20:57Z 2014-10-21T08:49:17Z 2015-01-01T00:00:00Z 2015-01 2017-04-13T09:04:05Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.lnec.pt:8080/jspui/handle/123456789/1005601 |
url |
http://repositorio.lnec.pt:8080/jspui/handle/123456789/1005601 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
2041-3017 doi: 10.1177/0954409713499016 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
SAGE Publications on behalf of IMechE |
publisher.none.fl_str_mv |
SAGE Publications on behalf of IMechE |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799136877454819328 |