ABSTRACT
In the following paragraphs the tensile properties of geomembranes and geogrids are discussed. Geogrids were first introduced into North America in the early 1980s. Tensile properties and creep strain are significantly affected by the type and composition of the various resins. The GRI Standard of Practice GG4a 'Determination of the LongTerm Design Strength of Stiff Geogrids' addresses all the above-noted variables which should be accounted for in determining long-term load carrying capacity. The junction efficiency of structural geogrids ensures adequate load transfer from the ribs through the junction to the adjacent ribs. Typically, a mechanical joint is normally used to connect structural geogrids at roll ends. Innovative use of structural geogrids provides a means of establishing a new structurally-secure landfill constructed atop an existing facility. Structural geogrids have been used to support lining systems constructed over areas having the potential to exhibit differential settlements and localized subsidence.
