THE MAGNITUDE OF POISSON'S RATIO OF UNBOUND LAYERS IN ROAD PAVEMENTS

EIN BEITRAG ZUR GROESSE DER QUERKONTRAKTIONSZAHL UNGEBUNDENER SCHICHTEN IN STRASSENBEFESTIGUNGEN

The deformation behaviour of a road pavement consisting of one or more layers of unbound materials can be described by means of the modulus of elasticity e and Poisson's ratio my, values of which vary between 0 and 0,5 for the various materials. The influence of variations in my on the results of theoretical elastic analyses is examined. It is shown that even for the simplest case of the homogeneous half space the value of my used has a significant influence. With the aid of the program bisar the investigations have been extended to cover multi-layer systems for which values of the moduli of elasticity and the Poisson's ratios for the various layers are specified. For the most important soil types Lorenz has given my values of 0,314 for gravel and 0,495 for wet clay. From triaxial tests Hicks and Kohler have obtained my values between 0,2 and 0,9. For my to exceed 0,5 contradicts the mathematical theory of elasticity. It can be explained as being caused by dilatation or by loosening of the soil structure. For approximate calculations a stipulation of a constant my value of 0,5 is adequate in the case of unbound layers of road pavements. (TRRL)

  • Availability:
  • Corporate Authors:

    Kirschbaum Verlag

    Siegfriedstrasse 28
    Bonn,   Germany  D-53179
  • Authors:
    • Gerhardt, T
  • Publication Date: 1978-4

Language

  • German

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 138-141
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00324799
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1981 12:00AM