Banca de DEFESA: ALESSANDRO FIDELIS DOS SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ALESSANDRO FIDELIS DOS SANTOS
DATE: 28/02/2023
TIME: 14:00
LOCAL: Araxá - MG
TITLE:

TWO-DIMENSIONAL AND THREE-DIMENSIONAL ANALYSIS OF GEOTECHNICAL STABILITY OF OPEN PIT MINE

KEY WORDS:

3D numerical analysis, Limit Equilibrium, automatic search, critical surface, open pit mine.

PAGES: 79
BIG AREA: Engenharias
AREA: Engenharia de Minas
SUBÁREA: Lavra
SPECIALTY: Lavra a Céu Aberto
SUMMARY:

The stability analyses of slope commonly used in the practice of geotechnical engineering are two-dimensional. However, the three-dimensional evaluation tends to be more "rigorous", due to the consideration of the 3D geometric shape of the rupture surface, thus representing the actual condition most likely to occur in the field. However, the success of a numerical analysis of geotechnical stability of slope depends on the availability and quality of input data in the model, not limited to: original topography of the terrain, water level, final geometry of the georeferenced slope, geological parameters cos-geotechnical, among others.  The more sophisticated a numerical analysis is, the more input data is required of the engineer and computational processing time is longer. The use of inaccurate or superficially estimated data can trigger poor results, not validating the result obtained in the stability analysis. The case study of this work is an open pit mine located within the Mineral Complex of Patrocínio-MG, which began its activities in 2017.  This is an economical phosphate deposit that occurs in the central area of Saltpeter I. The project was initially designed to have a useful life of 85 years, with a final production forecast of 950 million tons ROM (Run of Mine). The perimeter of the final pit is expected to be 7.6 km and the maximum height of the pit is in the order of 300 meters, values that are reviewed annually by the mining team's geology and mining planning team. For sectorization of the critical stretch of the pit of this research, the automatic search tool of the Slide3 Software company Rocscience was used. The stability method adopted for the present research was the Limit Equilibrium Method (LEM) proposed by Morgenstern and Price in 1965 for two-dimensional problems with 1-meter-thick lamellae, later adapted to three-dimensional problems, where 2D lamellae were replaced by 3D columns, thus generalizing their use. The preliminary results of this research show similarities in the Values of SF obtained in 2D and 3D analyses, and the two-dimensional analyses are more conservative, thus justifying their daily use of geotechnical projects.

COMMITTEE MEMBERS:
Presidente - THIAGO BOMJARDIM PORTO
Interno - HILDOR JOSE SEER
Interno - MARCELIO PRADO FONTES
Externa à Instituição - LUMA ALVARENGA CARVALHO DE VASCONCELOS - UFOP
Externo à Instituição - THIAGO CRUZ BRETAS - UFOP