Análise de estabilidade tridimensional em talude de aterro sanitário estabilizado com dique de solo-leta

Abstract

This work investigates increasing the safety factor of a large landfill using a WTS-soil mixture through three-dimensional slope stability analysis. The research focuses on the detailed modeling of the landfill and the implementation of dikes as a preventive measure to increase the geotechnical and environmental safety of the structure. Autodesk AutoCAD Civil 3D and Rocscience Slide3 software were used for the three- dimensional modeling of the embankment, based on real topographic data and specific geotechnical parameters. The results of the initial stability analysis revealed critical areas on the northern slope of the embankment, where the calculated safety factors were below the values recommended by the NBR-11682 standard. As a solution, 3 m, 5 m and 7 m high dykes were modeled using a mixture composed of 85% local soil and 15% LETA, based on previous studies that demonstrated its effectiveness in waterproofing landfills. Subsequent analysis showed that the proposed dikes significantly improved the safety factors of the landfill, especially for the 7 m dike configuration, which showed safety factor values of 2.702, 2.519 and 2.037 for the three pore pressure variations (0.15, 0.30 and 0.60). The results indicate that three-dimensional modelling combined with the use of WTS-soil dykes is a promising approach for stabilizing large landfills, guaranteeing the safe disposal of solid urban waste.