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�- s> 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 structural components of landfills constructed over challenging subgrades. The characterization and model for the foundation is the most important component 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, R "Overview of Landfill Construction on Unstable Subgrades and Innovative Landfill Closure Considerations" Proceedinms_Admod ill De�s'g rons�te ion and Closure Seminar 2nd Edition,Albany, New York, Aug., 1990. Bonparte,R. and Berg,R. R.,"The Use of Polymer Geosynthetics to Support Roadways Over Sinkhole Prone Areas", PWgw&gL SmQnduhidiscivliU nan CQnfemnce on &in soles and the Enyiroruti=W Impacts of Karsts Orlando, Fl.,Feb 1987, pp. 437-445. Bowles,J. E., "Mound$tisn Analysis and Desim f%McGraw-Hill, Inc., New York, NY, 1982, 816 p. "Creep Behavior and I.,ong_Term Desi' n Load of Qeo,_grids", Geosynthetic Research Institute(GRI), GRI test Method GG3-87, 1987, 18 p. "Design of Tensai Gebgrid Reinforcement to Support Landfill Lining and Cover Systems" T ensar Technical Noteti: 3NM, The Tensar Corporation, Morrow, GA.,May 1989. Giroud,J. P., "Designing with Geotextiles", Materiaux et Constructions, Vol_ 14, No. 82, (Jut}-Aug 1981), pp 257-272. {l5)