Análise comparativa entre métodos de análise de estabilidade de taludes
Slope stability analysis is an integral step to guarantee the safety of hillsides and other slopes. These analyses commonly involve methods based on the limit equilibrium of the slope, applying the fundamental equations of statics to discrete, rigid portions of soil. There are other methods, such as...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/40493 |
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| Resumo: | Slope stability analysis is an integral step to guarantee the safety of hillsides and other slopes. These analyses commonly involve methods based on the limit equilibrium of the slope, applying the fundamental equations of statics to discrete, rigid portions of soil. There are other methods, such as the finite element method (FEM), that quantify the safety of a slope based on the strains and displacements imparted on the soil. This method presents itself as a more reliable modelling of the slope’s internal mechanics and as such, capable of more trustworthy results. However, the use of FEM in geotechnical engineering is a somewhat recent development, professionals have less experience with it, leading to a lack of an anchor with which to compare their analysis results. Thusly, this paper has the objective of analyzing the stability of several slopes through the finite element method, as well as the most regularly used traditional equilibrium methods. For this, 75 homogenous slopes were modelled in commercial software, with varied declivities, heights and humidity configurations, as well as 2 real slopes found in the city of Natal, Brazil, onto which different humidity configurations were tested. These slopes were analyzed with the Fellenius or ordinary method, Bishop’s, Spencer’s, Janbu’s, Morgenstern-Price’s and Sarma’s methods as well as the FEM. From the analyses, it was observed that the results of Bishop’s, Spencer’s, Janbu’s and Morgenstern-Price’s methods correlated well with the FEM results in both the factor of safety and the slip surface’s geometry. The ordinary method put forth very conservative factors of safety, while Sarma’s method presented the highest values throughout. With this paper, a basis of comparison is established, allowing factors of safety calculated through FEM to be better interpreted, comparing them with the other methods. |
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