Navegando por Assunto "Barragens - Estabilidade"

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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.