Inclusion of the fibres reinforcement effect in the analysis of slope stability in msw landfill - application to bandeirantes landfill case

Andre Vinicius Azevedo  Borgatto; Claudio Fernando  Mahler

doi:10.15626/Eco-Tech.2007.050

Authors

Andre Vinicius Azevedo Borgatto Federal University of Rio de Janeiro, Brazil
Claudio Fernando Mahler Federal University of Rio de Janeiro, Brazil

DOI:

https://doi.org/10.15626/Eco-Tech.2007.050

Keywords:

Municipal Solid Waste (MSW); Stability Analysis; Sanitary Landfill.

Abstract

In Germany, in the 1990 decade, new models of stability analysis in sanitary landfills had
been developed. These models were based in the study of reinforcement effect of the fibres
present in the composition of the MSW. This reinforcement comes from materials as plastics,
papers, cardboards, rubber, wood and textiles. The reinforcement in the MSW shear strength
can be denominated as fibrous cohesion or pseudo-cohesion. For the inclusion of this
reinforcement it is necessary to classify the waste according to its morphology. Percentage of
materials with dimension I + dimension 2 will indicate the values to be used. For this
classification the German technical recommendation GDA E 1-7 should be followed [I] .
According to this recommendation, in stability analyses of sanitary landfills, the model
considering the reinforcement effect of the fibres should be used. It intends to bring a better
understand of the factors that had lead into failures in the past in landfills (back-analysis). In
addition to that, this model can be used in designing of new landfills and studies to make
higher landfills areas in operation.
In this work, the failure occurred in the Bandeirantes landfill located in Sao Paulo city, Brazil,
was used as an application model. Besides that, Bandeirantes case was carried out as an
extension of the study developed by [2] using the Gennan model of stability analysis. For the
accomplishment of the back-analysis contained in this work, it was used a software developed
in Germany (GGU-Stability) which considers in its calculations the fibres reinforcement
effect through the inclusion of a new strength parameter - angle of internal tensile forces (s).
The results had shown that, in the time when the waste started to slide down, only the friction
component was responsible for the shear strength. Therefore, the cohesive activated
component was contributed by the fibres reinforcement, as a consequence of the landfill waste
age.

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References

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