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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.

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