The construction of mechanically stabilized earth retaining wall using Tensar geogrids on a Chatham County, Georgia project in 1987 represented the first use of geogrid material in retaining wall construction in the state. Because the polyethylene material used in the geogrids is subject to creep under tensile loads over long periods of time, it was decided to monitor the performance of this wall and the geogrid material. The objectives of this study were to determine the elongation and strain levels of the geogrid at various elevations in the wall, and monitor horizontal and vertical movements of the retaining wall panels at certain points. The monitoring was performed at two to five month intervals for a period of three years after the wall was completed. The study concluded that the retaining wall performed satisfactorily, although movements due to creep continue to occur at a very slow rate. Total strain levels of the geogrid were found to be within acceptable limits, as were the vertical settlements of the wall panels. Horizontal movements, due to creep, mobilization and deformations were within reasonable limits, although larger movements should be expected with this wall type than with walls reinforced with metal straps. Tensar designed geogrid walls were recommended as alternates to walls reinforced with metal straps for walls fifteen to twenty feet high. Other recommendations included increasing panel batter, limiting geogrid design strength to control creep, and continuing to monitor extensometer movements over the next five years to study the creep rate of the grid.

  • Corporate Authors:

    Georgia Department of Transportation

    One Georgia Center
    600 West Peachtree Street, NW
    Atlanta, GA  United States  30308

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Scruggs, T E
  • Publication Date: 1990-10

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 38 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00607697
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-GA-90-8711, GDOT RP No. 8711
  • Created Date: Apr 30 1996 12:00AM