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Critical State Loci of Superheavy Iron Ore Tailings from Sampling in Brumadinho Reservoir.

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Bibliographische Detailangaben
Titel: Critical State Loci of Superheavy Iron Ore Tailings from Sampling in Brumadinho Reservoir.
Autoren: Delgado, Bruno G.1 (AUTHOR) bruno.delgado@vale.com, Viana da Fonseca, António2 (AUTHOR) viana@fe.up.pt, Bittar, Rafael J.3 (AUTHOR) rafael.bittar@vale.com, Besenzon, Davide4 (AUTHOR) besenzon@espol.edu.ec, Molina-Gómez, Fausto5 (AUTHOR) fausto@fe.up.pt, Cordeiro, Diana5 (AUTHOR) diana.cordeiro@ngi.no, Mendonça, António5 (AUTHOR) geoestruturar@uol.com.br, Rios, Sara6 (AUTHOR) sara.rios@fe.up.pt
Quelle: Journal of Geotechnical & Geoenvironmental Engineering. Oct2025, Vol. 151 Issue 10, p1-11. 11p.
Schlagwörter: *TAILINGS dams, *SOIL mechanics, *GEOTECHNICAL engineering, *FLUID mechanics, *MECHANICAL behavior of materials, *IRON ores
Geografische Kategorien: MINAS Gerais (Brazil), BRAZIL
Abstract: The uniqueness of critical state loci remains uncertain, which is a factor of significant importance in tailing storage facilities in which these lines play a fundamental role in structure stability and design. This study explored the uniqueness of compression and critical state lines (CSLs) for iron ore silty-sand tailings collected from Dam B1 in Minas Gerais, Brazil, under different stress paths. These tests were conducted using remolded samples and were tested with different state conditions (loose and dense), consolidation paths (isotropic and anisotropic), and shearing paths (compression and extension) under drained and undrained conditions. The triaxial results were analyzed in the light of the critical state soil mechanics (CSSM) framework, providing a reliable interpretation of the soil behavior. Although the critical state line in the void ratio versus mean effective stress space tends to be similar for both compression and extension triaxial tests, the instability locus is different. These findings underscore the importance of characterizing the mechanical behavior of these complex materials for the safe design and operation of tailings storage facilities. Practical Applications: This work details the mechanical behavior of a nontextbook material collected at the failure surface of an emblematic mine tailings dam failure case study. The aim is to contribute to the best geotechnical engineering practices for tailings storage facilities (TSFs), namely for the Engineering of Record (TSF technical accountability). It demonstrates that the rigorous understanding of the tailings mechanical behavior requires the adoption of advanced laboratory tests, not necessarily complex, implementing specific testing procedures. The accuracy of the test results increases the confidence in evaluating tailings hydromechanical behavior and associated parameters to feed constitutive models based on the critical state soil mechanics framework. The mining industry already uses these models to capture the postpeak instability frequently observed in tailings disposed in hydraulic fills, which can lead to flow liquefaction. [ABSTRACT FROM AUTHOR]
Datenbank: Academic Search Index
Beschreibung
Abstract:The uniqueness of critical state loci remains uncertain, which is a factor of significant importance in tailing storage facilities in which these lines play a fundamental role in structure stability and design. This study explored the uniqueness of compression and critical state lines (CSLs) for iron ore silty-sand tailings collected from Dam B1 in Minas Gerais, Brazil, under different stress paths. These tests were conducted using remolded samples and were tested with different state conditions (loose and dense), consolidation paths (isotropic and anisotropic), and shearing paths (compression and extension) under drained and undrained conditions. The triaxial results were analyzed in the light of the critical state soil mechanics (CSSM) framework, providing a reliable interpretation of the soil behavior. Although the critical state line in the void ratio versus mean effective stress space tends to be similar for both compression and extension triaxial tests, the instability locus is different. These findings underscore the importance of characterizing the mechanical behavior of these complex materials for the safe design and operation of tailings storage facilities. Practical Applications: This work details the mechanical behavior of a nontextbook material collected at the failure surface of an emblematic mine tailings dam failure case study. The aim is to contribute to the best geotechnical engineering practices for tailings storage facilities (TSFs), namely for the Engineering of Record (TSF technical accountability). It demonstrates that the rigorous understanding of the tailings mechanical behavior requires the adoption of advanced laboratory tests, not necessarily complex, implementing specific testing procedures. The accuracy of the test results increases the confidence in evaluating tailings hydromechanical behavior and associated parameters to feed constitutive models based on the critical state soil mechanics framework. The mining industry already uses these models to capture the postpeak instability frequently observed in tailings disposed in hydraulic fills, which can lead to flow liquefaction. [ABSTRACT FROM AUTHOR]
ISSN:10900241
DOI:10.1061/JGGEFK.GTENG-13055