PREDICTION OF FLEXIBLE PAVEMENT RESPONSE USING NON-LINEAR STRESS-DEPENDENT MATERIAL MODELS

Generally, low-volume pavements consist of unbound granular bases and subgrades with thin asphalt concrete surface. The strength and resilient behaviors of those base and subgrade materials are greatly dependent on the stress state within the layer. Therefore, it needs more elaborate material models in quantifying for actual non-linear stress-sensitive responses in flexible pavements. It is for this purpose that the non-linear finite element program (FERUT) for rut prediction in pavement has been developed. Stress-dependent models for the resilient modulus and Poisson's ratio of the pavement materials are incorporated into the finite element model to predict the resilient behavior within the pavement layers under specified traffic loads. The developed finite element program is verified by comparing the results obtained from other pavement structural models. The results from this study show that the developed finite element model with the stress dependency is suitable for reducing the horizontal tension in the bottom half of the unbound aggregate base layers. This indicates that the effects of the non-linearity and stress-dependency of the unbound pavement layers in flexible pavement system could be substantial and the proper selection of material properties is very important to improve the prediction of those behaviors. For the covering abstract see ITRD E118503.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 231-40
  • Serial:
    • Volume: 1

Subject/Index Terms

Filing Info

  • Accession Number: 00963793
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 90-5809-398-0
  • Files: ITRD
  • Created Date: Oct 3 2003 12:00AM