PULL-OUT TESTING FACILITY FOR GEOSYNTHETICS. FINAL REPORT

The considerable increase in using geosynthetics in soil reinforcement made it necessary to develop methods of measuring the interaction properties and modeling load transfer in reinforced-soil structures. The large number of factors that influence the interaction mechanism makes it difficult to standardize the equipment design, testing methodology and data interpretation procedure. These factors are mainly related to the equipment boundary effects, testing conditions, and soil and geosynthetics properties. In order to develop a methodology for evaluating the interface properties of geogrids, a pull-out box and a direct shear box are constructed and instrumented. A testing program is conducted to evaluate the performance of the facility and the effect of different testing parameters (e.g. specimen dimensions, soil thickness, box boundary effects, pull-out rate, soil compaction and relative density, and confining pressure) on the pull-out interaction mechanism of geogrids. Standard equipment design and testing procedure are recommended to overcome most of the limitations in the current practice. A data analysis procedure is established to determine the interface properties and the confined reinforcement characteristics from pull-out test results. The data analysis incorporates the effect of reinforcement extensibility on the soil-geogrid interface mechanism. The interface parameters are evaluated through comparison with the results from tests performed in the large direct shear box.

• Record URL:
  • http://www.ltrc.lsu.edu/pdf/2008/fr_240.pdf
• 
• Corporate Authors:

  Louisiana Transportation Research Center

  4101 Gourrier Avenue
  Baton Rouge, LA  United States  70808

  Louisiana Department of Transportation and Development

  1201 Capitol Access Road, P.O. Box 94245
  Baton Rouge, LA  United States  70804-9245

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Farrag, K
• Publication Date: 1991-10

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 238 p.

Subject/Index Terms

• TRT Terms: Data analysis; Direct shear tests; Geogrids; Geosynthetics; Geotextiles; Granular soils; Load transfer; Mathematical analysis; Mechanically stabilized earth; Performance evaluations; Pull out test; Test facilities
• Subject Areas: Geotechnology; Highways; Materials; I35: Miscellaneous Materials;

Filing Info

• Accession Number: 00620643
• Record Type: Publication
• Report/Paper Numbers: FHWA/LA-91/240
• Contract Numbers: 87-1GT
• Files: TRIS, USDOT, STATEDOT
• Created Date: Mar 31 1996 12:00AM