MOISTURE TRANSIENTS AT THE PAVEMENT EDGE: ANALYTICAL STUDIES OF THE INFLUENCE OF MATERIALS AND CROSS-SECTION DESIGN

The paper describes the development and application of theoretical analyses of the infiltration of water from the surface of an unsealed road shoulder into the pavement and the subsequent redistribution and drainage of this infiltrated water. A review of the properties of a wide range of unsaturated granular soils enables the moisture characteristics of compact, granular pavement materials to be described in a form suitable for engineering design application. A simplified model of one-dimensional infiltration is then introduced to assist in interpreting more complex flow situations and to provide a basis for concise presentation of patterns of pavement edge infiltration and drainage. For theoretical analysis of two-dimensional moisture transients at the pavement edge, the governing equations for unsaturated flow in non-swelling soils are solved by numerical analysis. These techniques are outlined and predictions are compared with the results of simple experiments. Quasi-non-dimensional patterns of edge infiltration and drainage are then presented to describe the standard case of full width construction on an impermeable subgrade in some detail, and then to show how conditions are altered as a result of variations in the cross-section design. The designs which are analysed include cross-sections in which the shoulders are less permeable than the pavement base and cross-sections with various types of subdrainage. /Author/TRRL/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 497-516
  • Serial:
    • GEOTECHNIQUE
    • Volume: 27
    • Issue Number: 4
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00174113
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jun 28 1978 12:00AM