History and future of a landfill with Non-common geogrid Reinforcements
The Böschistobel landfil in the western part of Austria is located in a mountainous region and had to be ebedded on a hillside. This resulted in an unusual geometry of the planned 70m high landfill body: one third of the basal system is almost horizontal and two thirds are inclined following the excavated slope of 1v:2h with berms in the hill. In the early 90´s the basal system was installed in the horizontal section and on two of the lowest slope sections, inclusive of the geomembrane, and infill of municipal waste started. In 1995-1996 high-strength low-strain geogrids from Aramid (AR) were installed on the two lowest slpoe sections as "anti-sliding" reinforcement accompanied by a measurement program. In 1996-1997 the rate of infilling of municipal waste decreased significantly. In 2013 the owner decided to reactivate the landfill and to desposit construction debris and/or ashes on top of the old municipal waste, up to the planned height of 70 meters. Detailed multiple stability analyses were performed resulting in a solution with further strong low-strain "anti-sliding" geogrid reinforcement on the slope section, above those already reinforced in the 90´s, and in multilayered geogrid reinforcement with a tensile strength of up to 1200 kN/m directly in the new fill material. The general situation, solution and experience from 1994-1996 are presented followed by a description of the situation, philosophy, design analyses and solutions in the new "reactivation era".
The landfill Böschistobel in Austria was constructed amd put into operation at the beginning of the 90ies as a landfill exclusively for municipal waste. Geometry and position in a hilly area quite specific. In 1995-1996 aramid geogrids with up to 1200 kN/m strength were installed as "anti-sliding" reinforcement to ensure the global sliding stability of the calculations were performed varying waste disposal scenarios, failure modes and infill stages. Based on the positive consideration again. High-strength geogrids from Polyvinylalcohol (PVA) and Polyester (PES/PET) with up to 1600 kN/m strength are foreseen and started being installed.