Banca de DEFESA: LUCAS ANDRADE E SOUZA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LUCAS ANDRADE E SOUZA
DATE: 15/08/2023
TIME: 10:30
LOCAL: Microsoft Teams
TITLE:

GEOTECHNICAL EVALUATION OF THE STABILITY OF A TAILINGS DAM BY PROBABILISTIC AND DETERMINISTIC METHODS

KEY WORDS:

Dam; Geotechnics; Stability; Numerical analysis; Limit Equilibrium; Probabilistic Analysis; Deterministic Analysis.

PAGES: 131
BIG AREA: Engenharias
AREA: Engenharia de Minas
SUBÁREA: Lavra
SPECIALTY: Lavra a Céu Aberto
SUMMARY:

The stability analysis aims to verify the possibility of failure of the massif in an artificial or natural slope. The analysis is performed by comparing mobilized shear stresses and shear strength along a potential failure surface, from various design scenarios. The deterministic approach uses an estimate for each input parameter, however, it appears that, in nature, the properties of materials tend to be heterogeneous. Faced with this heterogeneity, oscillations may occur in the values adopted for the geotechnical parameters. The incorporation of probabilistic methods becomes an important tool to deal with the risks inherent to geotechnical works, since they incorporate the variability of project parameters, based on statistical distributions that consider the frequency of data occurrences and make it possible to calculate the probability of Rupture (PR) and the Reliability Index (β) of the structures. This research intends to reassess the safety of a tailings dam that broke in 2019 in the Iron Quadrangle of Minas Gerais, using deterministic and probabilistic analyses. Stability analyzes were performed using two deterministic (Morgenstern-Price and Spencer) and probabilistic (FOSM and Monte Carlo) methods. The results indicate that the position of the water table significantly influences the PR and β values. The choice of rupture surface is extremely important for calculating the Factor of Safety. In this research, the non-circular surface was more critical than the circular one for the two probabilistic methods considered. The FOSM method presented more conservative responses when compared to Monte Carlo, regardless of the position of the water level inside the dam.

COMMITTEE MEMBERS:
Presidente - THIAGO BOMJARDIM PORTO
Externo ao Programa - ARMANDO BELATO PEREIRA
Externo à Instituição - ALBERTO DE SAMPAIO FERRAZ JARDIM SAYÃO - PUC - RJ
Externa à Instituição - ANDREA NASCIMENTO VECCI - PUC - RJ
Externo à Instituição - GUILHERME PEREIRA PINTO - UERJ
Externa à Instituição - LAYS CRISTINA BARCELOS DE SOUZA D'HYPPOLITO - PUC - RJ