Design guidance for protection of geomembrane liners in landfill applications

A new method of evaluating strains and predicting required protection layers that are placed over geomembranes is developed based on the combined effects clay strength stiffness cushioning effect a nonwoven layer. Plots giving geotextile for different maximum presented expected landfill pressures under 300 kPa angular, 38 mm gravel above geomembrane liner both drained undrained loading conditions clay. similar plot also given tire-derived aggregate 500 conditions. All tests were conducted at room temperature. For all cases, geosynthetic with mass per unit area (MUA) exceeding least 1200 g/m 2 to limit long-term below current threshold levels. The MUA layer, particular aggregates tested, dependent rate, water content relative optimum, silt content, activity below.