Abstract
In Germany, in the 1990 decade, new models of stability analysis in sanitary landfills hadbeen developed. These models were based in the study of reinforcement effect of the fibrespresent 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 strengthcan be denominated as fibrous cohesion or pseudo-cohesion. For the inclusion of thisreinforcement it is necessary to classify the waste according to its morphology. Percentage ofmaterials with dimension I + dimension 2 will indicate the values to be used. For thisclassification the German technical recommendation GDA E 1-7 should be followed [I] .According to this recommendation, in stability analyses of sanitary landfills, the modelconsidering the reinforcement effect of the fibres should be used. It intends to bring a betterunderstand of the factors that had lead into failures in the past in landfills (back-analysis). Inaddition to that, this model can be used in designing of new landfills and studies to makehigher 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 anextension of the study developed by [2] using the Gennan model of stability analysis. For theaccomplishment of the back-analysis contained in this work, it was used a software developedin Germany (GGU-Stability) which considers in its calculations the fibres reinforcementeffect 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 frictioncomponent was responsible for the shear strength. Therefore, the cohesive activatedcomponent was contributed by the fibres reinforcement, as a consequence of the landfill wasteage.
Highlights
In the waste mechanics up to now, a consensus does not exist between the theories and models developed that try to express the Municipal Solid Waste (MSW) behavior
The back-analysis of the failure occurred in the Bandeirantes sanitary landfill considering the reinforcement effect of the fibres was compared to the analysis presented in [7) which was analyzed through the classic methods of the soil mechanics
Where: Angle of internal tensile force((): value of t; = 35e° regarding fresh waste; Correction factor(a): Factor used to correct the inclination between the fibres and the rupture surface
Summary
In the waste mechanics up to now, a consensus does not exist between the theories and models developed that try to express the MSW behavior. Stability analyses in sanitary landfills have been carried out using theories and methods of the soils mechanics, through the adoption of shear strength parameters, cohesion (c) and angle of friction (J) for MSW. These parameters are usually obtained through international bibliographies, field tests, back analyses of landfill failures and laboratory tests. The shear strength of MSW is originated by the friction among the grains and for the fibrous cohesion or in other words the reinforcement effect of the fibres presents in the composition of the waste. Important conclusions concerning waste mechanical behaviour were obtained from these projects, mainly regarding slope stability analyses and determination of MSW shear strength (Jessbergere, 1993; Jessberger, 1995; Kockel, 1995) [3, 4]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
