Effect of hydraulic hysteresis on low-traffic pavement deflection

In many European countries, low-traffic pavement design is based on linear elastic calculations, and to limit the risk of rutting, a strain criterion, limiting the vertical elastic strain at the top of the soil layer is used. However, the unsaturated state and especially the different hydraulic behaviours during the drying and wetting cycles (hysteresis phenomenon) have been rarely taken into account in modelling of road pavements. The objective of this work is to study the effect of the hydraulic hysteresis of the granular materials on the deflection of pavement. The Soil Water Retention Curves as well as the repeated load triaxial tests provide the necessary experimental results to characterise the hydro-mechanical behaviour of these granular materials. A finite elements modelling of a low-traffic pavement has been carried out with CAST3M at different saturated, intermediate and dry conditions for the granular materials. The influence of the hysteresis phenomenon on the deflections is more pronounced at the dry condition.

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  • English

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  • Accession Number: 01538716
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 29 2014 3:00PM