Navegando por Assunto "Barragens de terra"

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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)
Interpretação e aplicação dos níveis de controle do monitoramento geotécnico na avaliação de segurança de barragens de mineração
(Universidade Federal do Pará, 2018-05-11) SOUZA, Deni Otávio Oliveira de; LIMA NETO, Aarão Ferreira; http://lattes.cnpq.br/0287664572311345
The importance of monitoring and analyzing dams' safety in reducing the risk imposed by these structures is well known. Structural monitoring aims at various objectives ranging from evaluating the performance against the projected, evaluating the safety of the structure and establishing new theories. However, instrumentation has been increasingly biased to support the stability analysis, and consequently, to limit the safety evaluation of the projects. If it was not enough to limit the role of monitoring in the projects and citations of legislation, it was very important for a tool, called by some professionals as a risk chart, which establishes levels of control, attention, alert and emergency related to reading of each instrument. However, these control or reference levels may be being used widely and mistakenly to determine dam safety by overlapping or superseding judgment by engineering professionals in many cases. In addition, criteria for the application of a methodology for the elaboration of levels of control through the deterministic method were presented, considering the instruments that make up the main section of a mining dam, applying a methodology to define the levels of attention, alert and instrument, in order to assist in the prior analysis of the structure monitoring data and to automatically identify possible deviations in the instrument reading pattern. In this way, limits were established for the control levels of the instruments and the results obtained were used in the implementation of a pre-alarm system associated to a standard response procedure in relation to the level of control informed, with the purpose of improving the control and safety of the structure. Finally, this work sought to reflect on the application of this monitoring control tool in the safety of mining dams, making a critical analysis of technical concepts applied to the risk analysis of the structure, which led to a conclusion that the nomenclatures used for control levels and widely used risk charts should be reviewed so that they are not mistakenly associated with the risk of the structure or the Emergency Action Plans of mining dams.