RATIONAL MODEL FOR THE FLEXIBLE PAVEMENTS DEFORMATIONS. SIXTH INTERNATIONAL CONFERENCE, STRUCTURAL DESIGN OF ASPHALT PAVEMENTS, VOLUME I, PROCEEDINGS, UNIVERSITY OF MICHIGAN, JULY 13-17, 1987, ANN ARBOR, MICHIGAN

The improvement of flexible pavement design methods required for the Laboratoires des Ponts et Chaussees in France the development of research and experimentations in three ranges: (1) The unbound granular materials and soils behaviour study; (2) The creation of a numerical analysis model; and (3) The pavements behaviour observation. The first part of the paper presents the experimental results on the materials. The studies achieved with the repetitive loading triaxial on the unbound granular materials allowed the modelling of the nonlinear elastic behaviour of these materials and the drawing of relationships between a "permanent deformations modulus", the loadings number and the stresses which are applied. It is also demonstrated that for a family of UGM completely crushed, the elastic performances are above all dependent on the chippings shape and that the permanent deformations are very related to the moisture content. For the subgrades it is shown that the elastic deformations are related to the effective pressure due to the weight of the soil and the pavement structure. The relationships, determining the permanent deformations modulus, also take into account this parameter, the value of which is dependent on the hydrological environment of the pavement. The second part of this paper is composed of the presentation of a design method allowing the determination of the internal forces and the rutting of a pavement. For the first time, the stresses obtained in reversible deformations are determined. For this, a nonlinear finite element method, which allows taking into account the behaviour laws obtained experimentally, is used. The advantage of this method is at first explained by an example comparing the results obtained with those corresponding to a linear elastic behaviour of the materials. It is then demonstrated how the systematic utilization of such a method allows the determination of charts for pavement design.

  • Corporate Authors:

    University of Michigan, Ann Arbor

    Department of Civil Engineering
    Ann Arbor, MI  United States  48109
  • Authors:
    • Jouve, P
    • MARTINEZ, J
    • PAUTE, J L
    • Ragneau, E
  • Publication Date: 1987

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  • Accession Number: 00485475
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 31 1989 12:00AM