LABORATORY MODEL TESTS TO EVALUATE GEOTEXTILE SEPARATORS IN-SERVICE

The paper summarizes the results of cyclic plate load tests on three different thicknesses of base aggregate, various types and weights of separator geotextiles, and two soft subgrade soils (CBR ranging from 0.5 to 7). Separators investigated included heat bonded nonwovens (140 and 200 g/m2), needle-punched nonwovens (140 and 280 g/m2), and a woven slit-film (140 g/m2), a "perfect" (graded granular) filter, and a "perfect" (geomembrane) separator. Geotextile survivability, rut depths, pore water pressures developed in the subgrade during cyclic loading, and potential fines migration through the geotextile and into the base course were all carefully monitored. It was found that if they survived installation and dynamic stresses, the geotextiles performed their intended separation function quite well. Pore water pressures in the subgrade increased initially and then decreased as the number of loading cycles increased. Peak pore pressures depended on aggregate thickness, subgrade soil type, and CBR, but appeared to be independent of geotextile type and weight. Some geotextile clogging was observed, but it did not cause any significant increase in generated subgrade pore pressures; fines migration was insignificant.

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  • Corporate Authors:

    Industrial Fabrics Association International

    345 Cedar Building, Suite 450
    St Paul, MN  United States  55101-1088
  • Authors:
    • W-T, Tsai
    • Holtz, R D
  • Conference:
    • Geosynthetics '97
    • Location: Long Beach, California, U.S.A.
    • Date: 1997-3-11 to 1997-3-13
  • Publication Date: 1997

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 633-646

Subject/Index Terms

Filing Info

  • Accession Number: 00795497
  • Record Type: Publication
  • ISBN: 0935803076
  • Report/Paper Numbers: Volume 2
  • Files: TRIS
  • Created Date: Jul 18 2000 12:00AM