Navegando por Assunto "Dam safety"

Agora exibindo 1 - 3 de 3

Acesso aberto (Open Access)
Análise do monitoramento de segurança de barragens de terra do aproveitamento hidrelétrico de Belo Monte: estudo de caso de diques do complexo no cenário do enchimento e operação
(Universidade Federal do Pará, 2019-12-12) MODESTO, Renan Ribeiro; ALENCAR JUNIOR, Julio Augusto de; http://lattes.cnpq.br/3663658632717465; LIMA NETO, Aarão Ferreira; http://lattes.cnpq.br/0287664572311345; https://orcid.org/0000-0002-5911-1368
In Brazil, an execution of earth dams or earth dams are quite common methods and used mainly to meet the demands of mining, irrigation or water storage for the production of hydroelectric energy. It is the importance or the monitoring and safety analysis of these rules to reduce environmental risks, safety factors, technological factors and observe the behavior and performance when planned. This dissertation seeks to understand dam safety monitoring procedures using items 01-A, 01-B and 01-C of the Belo Monte HPP intermediate reservoir by studying the different processes to ensure the safety of organizations. The methodological tracking adopted was carried out through the collection of technical information related to the studied structures, analysis of construction projects and verification of the methodologies adopted to contemplate the filling of reservoirs, reading of all or checklists that are field inspections, in addition to the data of the graphs, results of the auscultation instruments located in the body of the buses in the period of execution and operation that comprised the years 2015 to 2018. The type of research refers to a case study of documentary nature, since they are analyzed safety monitoring data in addition to the behavior of structures. The results reveal that, when compared to the safety procedures adopted at the international level, there is a shortage of the Brazilian safety inspection bodies, it refers to a more specific and clear methodology regarding the process of the first test of a reservoir, and in general lines , non-involved monitoring methods if associated, non-compliance in non-mandatory visual inspections or an instrumental reading outside the reference adopted as safety. However, when different non-conformities and / or anomalies present themselves both in visual inspection and in instrument monitoring, this action requires corrective action in the short term, as it is considered an unfavorable scenario in the security of the structure and associated with the strengthened correlation. to display a downstream of the structures.
Acesso aberto (Open Access)
Aplicação da ferramenta de risco FMEA para análises dos modos de falha de uma barragem de terra: estudo de caso Projeto Formoso do Araguaia-TO
(Universidade Federal do Pará, 2023-05-15) SANTOS, Andreia Arruda; GOUVEIA, Fernanda Pereira; http://lattes.cnpq.br/1772072130947378
The Formoso River Project, located in the state of Tocantins, is the largest irrigation project in Latin America and its structures, made up of three dams, have worried the supervisory body due to the compromised state of conservation of these structures, with evidence of pathologies and anomalies at various points. The state government, which is the developer of the dams, in 2012 even contracted revitalization projects for the enterprise, but to date the works have not been carried out, which makes the safety of the dams more vulnerable. The general objective of the research is to analyze the risk situation of the Calumbi II dam, which makes up the Rio Formoso irrigation project, through the application of the FMEA (Failure Mode and Effects Analysis) risk tool, identifying the most likely failure modes and with greater potential. Other objectives would be: the description of the interventions recommended by the consultancy hired by the entrepreneur and the critical analysis of the lack of dam safety management. The research methodology was based on four stages: a) characterization of the Rio Formoso Project and the case study dam; b) survey of anomalies and pathologies found in the dam; c) application of the FMEA risk tool and d) critical analysis of the dam's safety management case study. The results indicated that the Calumbi II dam presents several pathologies and anomalies (presence of large trees and shrub vegetation on the crest, retraction cracks, erosion and water surges on the slopes), and that despite the dam operating at minimum levels, failures may occur. The FMEA tool demonstrated that the highest priority failure mode would be upstream slope instability (NPR=336), secondly, failure due to piping (NPR=320) and thirdly, but more remote, failure due to dam overtopping ( NPR=144). From the aspect of the analysis of the safety management of the Calumbi II Dam, the vulnerability of the enterprise was concluded, since the dam does not have a PSB or PAE, it does not have installed instrumentation, there is no professional responsible for safety, it does not have studies of risk assessments, does not receive regular periodic inspections by the supervisory body.
Acesso aberto (Open Access)
Desafios para implantação dos protocolos estabelecidos no Padrão Global da Indústria para a Gestão de Rejeitos (GISTM), estudo de caso: estruturas de disposição de rejeitos no sudeste do Pará
(Universidade Federal do Pará, 2025-04-25) SOUSA, Rodolfo Pereira; SILVA, Adriano Frutuoso da; http://lattes.cnpq.br/3321059172343690; https://orcid.org/0000-0003-1710-8862
The creation of the Global Industry Standard on Tailings Management (GISTM) is a milestone for the world's largest mining companies, created with the aim of guaranteeing zero harm to communities and the environment This research aims to present the challenges of implementing the GISTM (Global Industry Standard on Tailings Management) for tailings disposal structures, located in the southeast of the state of Pará, being a dam, raised downstream, and a pit, which is an old mining area where the mineral reserve was exhausted in 2021. In order to assess the levels of compliance with the Global Standard, the technical collection of the tailings dam and pit was used to enable the application of the Compliance Protocols proposed by GISTM. The work presents the level of maturity in 3 stages, in the years 2023, 2024 and 2025. Although GISTM proposes requirements for an integrated analysis of tailings management, due to the different nature of the tailings disposal facilities, the facilities were evaluated in isolation. Based on the research, the dam was found to be more compliant with the items required by GISTM, with a more robust technical document framework than the pit. It is concluded that this result is correlated with the fact that the dam complies with Brazil's National Dam Safety Policy (PNSB), while the pit, as a tailings disposal structure, has no regulations for this use. In addition, it should be noted that although the pit is considered an unconventional disposal structure, the implementation of GISTM is required, subject to some adaptations in the understanding of what is proposed by the GISTM.