PERMANENT DEFORMATION IN A LINEAR VISCO-ELASTIC MODEL OF A ROAD PAVEMENT

The deformation of an idealised pavement composed of linear visco-elastic materials subject to a pulse load is analysed as a means of assessing the reliability of an approximate method of computing the permanent displacement of the surface of a pavement, based on the use of independently computed stresses in association with measured deformation properties. It is shown that, in the linear visco-elastic system, the permanent deformation is independent of the elastic properties of the materials, and depends only on their viscous properties, and that the permanent deformation in such a pavement model can be computed using an 'elastic' program supplied with values of the deformation parameters rather than the elastic constants. The results given by the visco-elastic analysis and by the approximate method in few cases are compared. In absolute terms, the approximate method seems unreliable, but it may give a reasonably reliable assessment of the relative performance of pavements. (A) /TRRL/

• Corporate Authors:

  Transport and Road Research Laboratory (TRRL)

  Wokingham, Berkshire  United Kingdom 
• Authors:
  • Thrower, E N
• Publication Date: 1975

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 16 p.

Subject/Index Terms

• TRT Terms: Continuous structures; Deformation; Mathematical analysis; Mechanical elasticity; Methodology; Mineral dislocations; Modulus of elasticity; Motion; Pavement base course; Pavement design; Pavement performance; Pavements; Repeated loads; Soils; Statistical distributions; Stresses; Surfacing; Theory; Thickness; Viscoelasticity
• Old TRIS Terms: Highway pavement
• ITRD Terms: 6471: Analysis (math); 9006: Continuous; 5595: Deformation; 6572: Distribution (stat); 5912: Elasticity; 5919: Modulus of elasticity; 5483: Movement; 3055: Pavement design; 5588: Repetitive loading; 2961: Roadbase; 4156: Soil; 5575: Stress (in material); 2972: Surfacing; 9078: Theory; 5933: Thickness; 5935: Viscoelasticity
• Subject Areas: Design; Geotechnology; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 00134335
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: TRRL SR 184UC
• Files: ITRD, TRIS, ATRI
• Created Date: Oct 6 1976 12:00AM