Numerical analysis of ballastless asphalt tracks subjected to dynamic loads

T. Bose; V. Zania; E. Levenberg

doi:10.1007/978-3-030-64518-2_30

Numerical analysis of ballastless asphalt tracks subjected to dynamic loads

T. Bose, V. Zania^*, E. Levenberg

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Abstract

This study presented the results of numerical analyses for a ballastless asphalt track. The asphalt layer was modelled as a linear viscoelastic (LVE) solid that was resting on an unbound granular layer (UGL) simulated as a non-linear (stress-state dependent) elastic medium. The mechanical properties of these layers were calibrated from laboratory element tests. For a given structural arrangement, the model was interrogated under a vertical impulse load to assess the sensitivity of selected responses to temperature and to the initial compactioninduced horizontal stresses in the UGL. It was found that horizontal tensile strains at the bottom of the asphalt layer, vertical stresses below the UGL, and vertical surface accelerations were all very sensitive to temperature levels. The vertical surface accelerations were also found to be sensitive to the level of compaction-induced stresses in the UGL. In contrast, the other two responses exhibited a moderate dependency on the lateral stresses. The results from this numerical study provide a better overall understanding of the mechanical behaviour of ballastless asphalt tracks.

Original language	English
Title of host publication	Challenges and Innovations in Geomechanics : IACMAG 2021
Publisher	Springer
Publication date	2021
Pages	249-257
ISBN (Print)	978-3-030-64517-5
ISBN (Electronic)	978-3-030-64518-2
DOIs	https://doi.org/10.1007/978-3-030-64518-2_30
Publication status	Published - 2021
Event	16th International Conference of the International Association for Computer Methods and Advances in Geomechanics - Politecnico di Torino Conference Centre, Torino, Italy Duration: 30 Aug 2022 → 2 Sept 2022 Conference number: 16

Conference

Conference	16th International Conference of the International Association for Computer Methods and Advances in Geomechanics
Number	16
Location	Politecnico di Torino Conference Centre
Country/Territory	Italy
City	Torino
Period	30/08/2022 → 02/09/2022

Series	Lecture Notes in Civil Engineering
Volume	126
ISSN	2366-2557

Keywords

Ballastless asphalt track
Compaction induced stress
Dynamic analysis
Finite element model
Temperature

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title = "Numerical analysis of ballastless asphalt tracks subjected to dynamic loads",

abstract = "This study presented the results of numerical analyses for a ballastless asphalt track. The asphalt layer was modelled as a linear viscoelastic (LVE) solid that was resting on an unbound granular layer (UGL) simulated as a non-linear (stress-state dependent) elastic medium. The mechanical properties of these layers were calibrated from laboratory element tests. For a given structural arrangement, the model was interrogated under a vertical impulse load to assess the sensitivity of selected responses to temperature and to the initial compactioninduced horizontal stresses in the UGL. It was found that horizontal tensile strains at the bottom of the asphalt layer, vertical stresses below the UGL, and vertical surface accelerations were all very sensitive to temperature levels. The vertical surface accelerations were also found to be sensitive to the level of compaction-induced stresses in the UGL. In contrast, the other two responses exhibited a moderate dependency on the lateral stresses. The results from this numerical study provide a better overall understanding of the mechanical behaviour of ballastless asphalt tracks.",

keywords = "Ballastless asphalt track, Compaction induced stress, Dynamic analysis, Finite element model, Temperature",

author = "T. Bose and V. Zania and E. Levenberg",

year = "2021",

doi = "10.1007/978-3-030-64518-2\_30",

language = "English",

isbn = "978-3-030-64517-5",

series = "Lecture Notes in Civil Engineering",

publisher = "Springer",

pages = "249--257",

booktitle = "Challenges and Innovations in Geomechanics",

note = "16th International Conference of the International Association for Computer Methods and Advances in Geomechanics, 16th IACMAG ; Conference date: 30-08-2022 Through 02-09-2022",

}

Bose, T, Zania, V & Levenberg, E 2021, Numerical analysis of ballastless asphalt tracks subjected to dynamic loads. in Challenges and Innovations in Geomechanics: IACMAG 2021. Springer, Lecture Notes in Civil Engineering, vol. 126, pp. 249-257, 16th International Conference of the International Association for Computer Methods and Advances in Geomechanics, Torino, Italy, 30/08/2022. https://doi.org/10.1007/978-3-030-64518-2_30

TY - GEN

T1 - Numerical analysis of ballastless asphalt tracks subjected to dynamic loads

AU - Bose, T.

AU - Zania, V.

AU - Levenberg, E.

N1 - Conference code: 16

PY - 2021

Y1 - 2021

N2 - This study presented the results of numerical analyses for a ballastless asphalt track. The asphalt layer was modelled as a linear viscoelastic (LVE) solid that was resting on an unbound granular layer (UGL) simulated as a non-linear (stress-state dependent) elastic medium. The mechanical properties of these layers were calibrated from laboratory element tests. For a given structural arrangement, the model was interrogated under a vertical impulse load to assess the sensitivity of selected responses to temperature and to the initial compactioninduced horizontal stresses in the UGL. It was found that horizontal tensile strains at the bottom of the asphalt layer, vertical stresses below the UGL, and vertical surface accelerations were all very sensitive to temperature levels. The vertical surface accelerations were also found to be sensitive to the level of compaction-induced stresses in the UGL. In contrast, the other two responses exhibited a moderate dependency on the lateral stresses. The results from this numerical study provide a better overall understanding of the mechanical behaviour of ballastless asphalt tracks.

AB - This study presented the results of numerical analyses for a ballastless asphalt track. The asphalt layer was modelled as a linear viscoelastic (LVE) solid that was resting on an unbound granular layer (UGL) simulated as a non-linear (stress-state dependent) elastic medium. The mechanical properties of these layers were calibrated from laboratory element tests. For a given structural arrangement, the model was interrogated under a vertical impulse load to assess the sensitivity of selected responses to temperature and to the initial compactioninduced horizontal stresses in the UGL. It was found that horizontal tensile strains at the bottom of the asphalt layer, vertical stresses below the UGL, and vertical surface accelerations were all very sensitive to temperature levels. The vertical surface accelerations were also found to be sensitive to the level of compaction-induced stresses in the UGL. In contrast, the other two responses exhibited a moderate dependency on the lateral stresses. The results from this numerical study provide a better overall understanding of the mechanical behaviour of ballastless asphalt tracks.

KW - Ballastless asphalt track

KW - Compaction induced stress

KW - Dynamic analysis

KW - Finite element model

KW - Temperature

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DO - 10.1007/978-3-030-64518-2_30

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BT - Challenges and Innovations in Geomechanics

PB - Springer

T2 - 16th International Conference of the International Association for Computer Methods and Advances in Geomechanics

Y2 - 30 August 2022 through 2 September 2022

ER -

Numerical analysis of ballastless asphalt tracks subjected to dynamic loads

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