PREDICTION OF PERMANENT STRAIN IN SAND SUBJECTED TO CYCLIC LOADING

The trend toward ever-inceasing axle loads on highways and airport pavements requires that new methods for pavement design and rehabilitation be developed. This paper introduces a simple and economical procedure whereby permanent strain in sand subjected to cyclic loading can be characterized by using stress and strain parameters from the universally accepted static triaxial test. To develop the procedure, duplicate samples were tested by using both a static triaxial apparatus and a closed-loop electrohydraulically actuated triaxial system. The dynamic test results were normalized with respect to parameters obtained from the corresponding static test. The normalized cyclic-principal-stress difference showed a unique relationship to the normalized accumulated permanent strain that was independent of moisture content, density, and confining pressure. Benefits to be gained by use of such a simplified procedure include significant saving of laboratory time and energy, as well as reduced equipment and personnel costs. Also, practicing engineers are more likely to accept the use of rational design methods if they have available a simple test procedure to characterize material behavior. (Author)

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• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Soil and Rock Properties.
• Authors:
  • Lentz, Rodney W
  • Baladi, Gilbert Y
• Publication Date: 1980

Media Info

• Media Type: Print
• Features: Figures; References;
• Pagination: pp 54-58
• Monograph Title: Embankment stabilization and soil mechanics
• Serial:
  • Transportation Research Record
  • Issue Number: 749
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Axle loads; Design methods; Driver rehabilitation; Dynamic tests; Forecasting; Pavement design; Repeated loads; Sand; Static tests; Strain (Mechanics); Test procedures; Triaxial shear tests
• Uncontrolled Terms: Rehabilitation
• Old TRIS Terms: Strains
• Subject Areas: Design; Geotechnology; Highways; Pavements; I42: Soil Mechanics;

Filing Info

• Accession Number: 00319358
• Record Type: Publication
• ISBN: 03090305905
• Files: TRIS, TRB
• Created Date: Dec 30 1980 12:00AM