USE OF THE GYRATORY TESTING MACHINE IN DESIGN AND/OR EVALUATION FOR REQUIRED THICKNESS ABOVE SUBGRADE

A rational method of designing flexible pavements against shear failure using the Gyratory Testing Machine is described and illustrated. The specific procedure described considers the element of material in the Gyratory Testing Machine (GTM) to represent directly an element in the pavement structure. For the sample, the theoretical vertical stress becomes the normal load and the measured shear represents the shear strength at that point for some selected value of strain. By comparing a plot of the induced vertical (normal) stress versus the induced shear stress with the measured shear for that induced normal shear, a Mohrs type analysis is achieved for the in-place stress at various depths beneath the load. The density of the soil for the various depths will vary, and will approach the ultimate condition as would be expected after reaching an essentially equilibrium condition under traffic.

Language

  • English

Media Info

  • Features: Appendices; Figures; Tables;
  • Pagination: p. 13-26
  • Serial:
    • VTI Conferens
    • Publisher: Swedish National Road and Transport Research Institute (VTI)
    • ISSN: 0347-6049

Subject/Index Terms

Filing Info

  • Accession Number: 00723361
  • Record Type: Publication
  • Report/Paper Numbers: No. 4A, Part 6
  • Files: TRIS
  • Created Date: Jul 30 1996 12:00AM