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-- SJlAtNtRI'y Over the last decade, the performance of landfill liners built over yielding foundations has been well documented. Strain measurement systems and leachate collection systems indicate that a layer of uniaxial geogrid has supported the strucWral components of landfills constructed over challenging subgrades. The characterization and model for the foundation is the most important comment of the design. Experience and precedence need to be combined with a site specific analysis when setting the parameters for a foundation comprised of municipal solid waste. The design objective is focused on limiting the strain in the liner system and soil arching and tension membrane theories are the back- bone of the design procedure. This paper discussed these issues and presented a design solution and example problem. 10.0 References Bertin, Y. (1978), "A Centrifuge Study of the Collapse of Hemispherical Cavities in Soil". Master's Thesis, University of Florida, 122 pp. Bonaparte, "Overview of Landfill Construction on Unstable Sub es and Innovative Landfill Closure Considerations! T in s d 5o coon and!Q19mm Seminy, 2nd Edition,Albany, New York, Aug., 1990. Y. Boni e, R. and Ber&R. R.,"'The Use of Polymer Geosynthetics-to Support Roadways Avec Sinkhole Prone Areasr, eding, Second M-ul idisci lrp�_Conference on Sinkholes and thevimmental Impacts of Kar sts,Orlando,Fl.,Feb 1987, pp.437-445. Bowles,I. E., "FQundatian Anabt&and Des[ ",McGraw-Hill, Inc., New York, NY, 1982, 816 p. "Creep Behavior and .,ong-Term Design Load Qf�g�rids", Geosynthetic Research Institute(GRI), GRI Test Method GG3=87, 1987, 18 p. "Design of Tensai Geogrid Reinforcement to Support Landfill Lining and Cover Systems' Tensar 12gMcai Note: WM3- The Tensar Corporation, Morrow, GA., May 1989. Giroud,I. P., "Designing with Geotextiles", Materiaux et Constructions, Vol. 14, No. 82, (Jul-Aug 1981), pp 257-272. {15)