Banca de DEFESA: ISABELA VASCONCELOS LEITE DE FREITAS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ISABELA VASCONCELOS LEITE DE FREITAS
DATE: 21/12/2023
TIME: 10:00
LOCAL: https://youtube.com/live/TStRMsgeT3w?feature=share
TITLE:

MONITORING AN IRON ORE TAILINGS DAM: CORRELATIONS BETWEEN GEOPHYSICAL AND GEOTECHNICAL DATA

KEY WORDS:

 Electrical resistivity, precipitation, time analyses, piezometry

PAGES: 50
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Geotécnica
SPECIALTY: Mecânicas dos Solos
SUMMARY:

Iron ore tailings dams must be constantly monitored for safety purposes. Among the aspects traditionally monitored are geotechnical aspects such as piezometric levels along the dam. Recently, geophysics, a science that studies, among other things, dynamic processes in the Earth, has contributed to non-invasive monitoring using electro-resistivity methods. Geophysical methods provide a large amount of data in relatively quick samples, but there is little information on the integration of traditional geotechnical and geophysical techniques. This work therefore aimed to evaluate the relationship between geophysical data, monitored every 15 days between May 2022 and March 2023, and geotechnical data from an iron ore tailings dam located in the Iron Quadrangle. The geophysical method used was two-dimensional electrical imaging with a Schlumberger array and analysis of variance and multiple regression were used to evaluate the relationship between resistivity values, piezometer level, sampling time, and rainfall. Electroresistivity was significantly explained by piezometry while sampling time and rainfall did not significantly explain electroresistivity. Therefore, the dam's electroresistivity patterns have not changed significantly over time and local rainfall does not imply an immediate response in resistivity. These conclusions can support new directions in decisions about monitoring iron ore tailings dams and therefore contribute to advances in dam safety in the mining sector.

COMMITTEE MEMBERS:
Presidente - HERSILIA DE ANDRADE E SANTOS
Interno - NATAL JUNIO PIRES
Externo à Instituição - LUCIANO MOZER DE ASSIS - ITV