Settlement behaviour of hybrid asphalt-ballast railway tracks

Zelong Yu; David P. Connolly; Peter Keith Woodward; Omar Laghrouche

doi:10.1016/j.conbuildmat.2019.03.047

Settlement behaviour of hybrid asphalt-ballast railway tracks

Zelong Yu, David P. Connolly, Peter Keith Woodward, Omar Laghrouche

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Abstract

The use of structural asphalt layers inside ballasted railway tracks is attractive because it can increase track bending stiffness. Therefore, for the first time, this paper investigates the long-term settlement characteristics of asphaltic track in the presence of a subgrade stiffness transition zone. Phased load cyclic compression laboratory tests are performed on a large-scale hybrid asphalt-ballast track, supported by subgrade with varying stiffness. It is found that an asphaltic layer acts as a bridge to shield the subgrade from high stresses. It is also found that the asphalt reduces track settlement, and is particularly effective when subgrade stiffness is low.

Original language	English
Pages (from-to)	808-817
Number of pages	10
Journal	Construction and Building Materials
Volume	208
Early online date	18 Mar 2019
DOIs	https://doi.org/10.1016/j.conbuildmat.2019.03.047
Publication status	Published - 30 May 2019

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title = "Settlement behaviour of hybrid asphalt-ballast railway tracks",

abstract = "The use of structural asphalt layers inside ballasted railway tracks is attractive because it can increase track bending stiffness. Therefore, for the first time, this paper investigates the long-term settlement characteristics of asphaltic track in the presence of a subgrade stiffness transition zone. Phased load cyclic compression laboratory tests are performed on a large-scale hybrid asphalt-ballast track, supported by subgrade with varying stiffness. It is found that an asphaltic layer acts as a bridge to shield the subgrade from high stresses. It is also found that the asphalt reduces track settlement, and is particularly effective when subgrade stiffness is low.",

author = "Zelong Yu and Connolly, {David P.} and Woodward, {Peter Keith} and Omar Laghrouche",

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AU - Yu, Zelong

AU - Connolly, David P.

AU - Woodward, Peter Keith

AU - Laghrouche, Omar

PY - 2019/5/30

Y1 - 2019/5/30

N2 - The use of structural asphalt layers inside ballasted railway tracks is attractive because it can increase track bending stiffness. Therefore, for the first time, this paper investigates the long-term settlement characteristics of asphaltic track in the presence of a subgrade stiffness transition zone. Phased load cyclic compression laboratory tests are performed on a large-scale hybrid asphalt-ballast track, supported by subgrade with varying stiffness. It is found that an asphaltic layer acts as a bridge to shield the subgrade from high stresses. It is also found that the asphalt reduces track settlement, and is particularly effective when subgrade stiffness is low.

AB - The use of structural asphalt layers inside ballasted railway tracks is attractive because it can increase track bending stiffness. Therefore, for the first time, this paper investigates the long-term settlement characteristics of asphaltic track in the presence of a subgrade stiffness transition zone. Phased load cyclic compression laboratory tests are performed on a large-scale hybrid asphalt-ballast track, supported by subgrade with varying stiffness. It is found that an asphaltic layer acts as a bridge to shield the subgrade from high stresses. It is also found that the asphalt reduces track settlement, and is particularly effective when subgrade stiffness is low.

U2 - 10.1016/j.conbuildmat.2019.03.047

DO - 10.1016/j.conbuildmat.2019.03.047

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VL - 208

SP - 808

EP - 817

JO - Construction and Building Materials

JF - Construction and Building Materials

ER -

Settlement behaviour of hybrid asphalt-ballast railway tracks

Abstract

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