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research article

Strain and stress distributions in flexible pavements under moving loads

Perret, J.
•
Dumont, A.-G.  
2004
International Journal of Road Materials and Pavement Design

Calculated strain distributions in flexible pavement were studied by comparison with measurements made on full-scale structures. The calculated results were obtained by elastic and viscoelastic modellings of these structures. As no stress measurements were collected, the stress distribution was studied by comparing the results of elastic and viscoelastic calculations. For different loading and temperature conditions, and assuming the hypothesis of the French design method for flexible pavement, modellings provided strain signals similar to those measured on real scale structures for strains at two different depths in the studied structures. This first conclusion was used to validate the models, which were then used in the stress study. Some unexpected strains variations were observed near to the surface of the structures. Modellings based on linear elastic behaviour of the materials made it possible to explain these variations by analysing the stress variations, particularly in the vertical direction. Viscoelastic modellings have shown that some additional stresses appear in the bituminous layer when the loads are moving away from the measurement point. These stresses are induced mainly by the reaction of the foundation layers (sub-base and sub-grade) and they are mainly caused by the interaction between the layers of the structures. Finally, the analysis of the strain and stress distributions near to the surface showed that bituminous materials are submitted to higher horizontal than vertical stresses just under the truck wheel. A particular and unexpected result of this situation is that the vertical strains at just under the wheel are tensile ones.

  • Details
  • Metrics
Type
research article
DOI
10.1080/14680629.2004.9689993
Author(s)
Perret, J.
•
Dumont, A.-G.  
Date Issued

2004

Published in
International Journal of Road Materials and Pavement Design
Volume

5

Issue

sup. 1

Start page

203

End page

225

Subjects

Flexible pavement

•

Pavement response

•

Elastic and viscoelastic modellings

•

Strain measurement

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LAVOC  
Available on Infoscience
January 17, 2008
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/16336
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