Limit equilibrium analysis on two- and three-dimensional models
DOI:
https://doi.org/10.14195/2184-8394_158_1Keywords:
stability analysis, back analysis, 2D and 3D modelingAbstract
2D stability analyzes are predominantly used in geotechnical practice, due to their practicality and results, most of them, more conservative, making 3D analyzes still little disseminated. For this reason, the present work aims to verify results of these two types of analysis from a case study for performing back analysis on a collapsed embankment. The analyzes were performed in the SVSlope program, by SoilVision Systems Ltd., using the limit equilibrium method of Morgenstern and Price (1965), adopting the Mohr-Coulomb rupture criterion to quantify the soil resistance parameters. Preliminarily, an extensive review on 2D and 3D analyses and backanalysis is presented, with the experience of different authors. Subsequently, the case study was analyzed. The results indicated that rupture surfaces compatible with the field situation were obtained for both analyses (2D and 3D), with a small difference of the rupture plane, with lower safety factors in the two-dimensional analyses. In the back-analyses, different resistance parameters were estimated for the 2D and 3D analyses, to obtain analogous results. However, the 3D back-analysis provided soil cohesion values lower than those of the 2D back-analysis.
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