Soil suction in pavement materials, particularly in fine-grained subgrade soils, has considerable influence on the performance of flexible pavements and is generally high in the predominantly semi-arid to arid climate of Australia. In these areas even clay subgrades show high resistance to traffic load. Soil suction changes can cause large volume changes in expansive clay subgrades, resulting in serious distortion and cracking of pavements. Efficient pavement design must, therefore, consider soil suction as a variable. With the pavement model described in this paper, spatial distribution data of soil suction can be predicted throughout the pavement at any time during its life and stored in the computer for subsequent analyses of stress and deformations in pavements caused by moisture-volume change and traffic loading. These analyses are the subject of later papers in this series. The model, based on a rational thermodynamic theory, was in good agreement with Terzaghi's consolidation theory for saturated soils and is extended to take into account unsaturated soils. It is, at present, the only known model that can predict useful transient results for unsaturated soils in many practical cases. /AUTHOR/

  • Corporate Authors:

    Commonwealth Scientific & Industrial Research Org

    314 Albert Street
    East Melbourne, Victoria,   Australia 
  • Authors:
    • Richards, B G
  • Publication Date: 1973

Media Info

  • Features: Figures; References;
  • Pagination: 18 p.
  • Serial:
    • Issue Number: 17

Subject/Index Terms

Filing Info

  • Accession Number: 00291152
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: R&D Rept.
  • Files: ITRD, TRIS
  • Created Date: Sep 19 1974 12:00AM