Geogrid reinforcement in landfill closures

This paper illustrates the use of geogrids in landfill closures from the perspective of both cover soil stability and subsidence-induced liner support. Both applications have as their objective the avoidance, or at least the minimization, of tensile stresses in the geomembrane. Case histories regarding each application are provided.

The important design consideration of long-term allowable strength of geogrids is also addressed. Factors such as geogrid creep, installation damage, chemical degradation, biological degradation and structural connections are discussed since all should be considered in arriving at a proper allowable design strength.