Stability and Sensitivity Analyses of an Industrial Waste Landfill with a Novel Final Cover System

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4. Stability and Sensitivity Analyses of an Industrial Waste Landfill with a Novel Final Cover System

A stability analysis was carried out for a novel final cover system adopted by a paper packaging industry in Obbola, Sweden, and was analysed for veneer failure along geosynthetic interfaces. The landfill was used to store industrial waste generated from the paper mill industry between 1970 and 2006. The novel cover system was made from in-house industrial by-products and locally available materials such as: compost as vegetation layer, bio ash, compost and local excavated soil as protection layers, shredded tyres as drainage layer and green liquor dredge mixed with rock dust as barrier layer. The cover was analysed as both finite and infinite slope for standard static cases and for cases with destabilizing forces of earthquake and seepage build-up on the cover system. Based on the results obtained for different values of interface friction angle along the geosynthetic, minimum interface friction angle required for stable slope was back calculated. The variation of the interface angle required with the slope of the landfill was also analysed. Further, the landfill cover system was numerically modelled to compare the analytical and numerical results. The analytical method for all cases yielded a lower value of factor of safety than the numerical results.  It was demonstrated that the software used in the study did not take into account the effect of interface friction angle for analysis of slope stability of the cover system. A method for incorporating the effect was also explored which showed good agreement with analytical results.

9th International Congress on Environmental Geotechnics (ICEG2023)

Landfilling