Programa de Pós-Graduação em Engenharia de Barragem e Gestão Ambiental - PEBGA/NDAE/Tucuruí
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/9395
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Navegando Programa de Pós-Graduação em Engenharia de Barragem e Gestão Ambiental - PEBGA/NDAE/Tucuruí por Orientadores "TEIXEIRA, Marcelo Rassy"
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Item Acesso aberto (Open Access) Análise numérica da estabilidade de taludes utilizando o método de Galerkin livre de elementos(Universidade Federal do Pará, 2017-05-03) SILVA, Davi Barbosa Costa da; TEIXEIRA, Marcelo Rassy; http://lattes.cnpq.br/8912916360456192The safety of dams is associated to the stability of the structures that compose them. In a earthfill dam, there are mentioned the slopes, which are surfaces that form an angle with the horizontal one. Its study using numerical methods, like the finite element method (FEM), makes possible the estimate of displacements, stresses and strains. It is aimed in this study to contribute in the efficiency of the numerical analysis devoted to the slopes. Through the development of a resource turned specifically to dams, the objective in the present work is to present an algorithm able to check the stability of slopes in the period of its construction using a numerical method without mesh. For the proposed analyses, there was used the element free Galerkin method (EFGM), applying it in the strength reduction method (SRM). After the idealization of a model and solution using the limit equilibrium method and the strength reduction method with the help of the FEM, both in commercial software (GeoStudio), there were obtained and were compared the results of a model in which there is applied the strength reduction method with the use of the EFGM. The analysis by the strength reduction method was divided in determination of the in situ stresses of the foundation, construction of the landfill and strength reduction of the soil. Numerically, in the stage of getting the in situ stresses, the EFGM presented better result when compared to FEM, taking as a reference the classic mathematical model of the soil mechanics for subhorizontal surfaces. In the stages of construction of the landfill and of strength reduction, the relative approximation error the EFGM regarding the FEM was nearly always superior to 5%. However, it noticed if that in the main answers, i.e. in the determination of the slip surface and of the strength reduction factor, the results were similar, as in the strength reduction method, with the EFGM regarding the FEM, as that regarding the limit equilibrium method. In the comparison with the FEM, there were obtained more conservative strength reduction factors. In spite of being an information not available openly, it concluded if that the elastoplastic constitutive model used in the commercial software is not the linear elastic perfectly plastic model, which was hypothesis adopted for the EFGM. Besides the differences due to the behavior idealized for the material, the application of meshfree method also requires more studies related to the definition of the representation of the domain. The main advantage of the adoption of the proposed method is the possibility to test more parameters in less time, which makes it useful in preliminary construction studies. For that, it must be observed that, in spite of the limitations in displacement estimation, which are useful to associate numerical results to the observations in field, the conditions in which there is slip at slope can be appreciated in satisfactory, conformable way when it was shown in comparisons with the most used methods.Item Acesso aberto (Open Access) Metodologia de seleção de rotas de evacuação de emergência para caso de rompimento da UHE-Tucuruí(Universidade Federal do Pará, 2019-01-30) GOTO, Raphaela Sobreira; TEIXEIRA, Marcelo Rassy; http://lattes.cnpq.br/8912916360456192Dams play an important role in Brazilian social and economic development. Although even when considered low risk, incidents involving dams can cause significant damage, and despite several potential costs resulting from material damages, the loss of a human life is the most meaningful in damage scale. Evacuation in case of disruption is a complex process that is the aggregated result of many factors, such as evacuation mode and characteristics of evacuation routes. In this context, the present work aims to determine a methodology for selecting emergency evacuation routes for the urban area of Tucuruí municipality located downstream of Tucuruí Hydroelectric Power Plant (UHE-Tucuruí), regarding the condition of a dam failure only. The methodology adopted is based on the optimization of evacuation routes, minimizing and/or excluding intersections along the way, this proposal follows an adaptation of route selection method developed by Zhang et al. (2016). The methodology was applied in four stages, the first was the division of the municipality into manageable zones according to the socioeconomic characteristics and road distribution, the second was the creation of the intersection table (adjacency) between the roads, the third was the determination of the exit routes, responsible for the displacement of the population to another municipalities and the fourth was the development of route selection method that has as a final product, a table of evacuation routes considering all possible exits of high risk area. The method establishes as the best route choice the one with the fewest intersections in the evacuation path. As a result, the methodology proved to be effective when applied in Tucuruí, generating possible evacuation routes within the entire urban perimeter of the municipality, providing affordability since it does not use software that requires a license and high application cost, being showed as a method of easy acceptability and communication among the population to be evacuated, providing time travel reduction, safer evacuation and traffic load balance between different exits.Item Acesso aberto (Open Access) Simulação numérica de derramamento de óleo na foz do rio Amazonas(Universidade Federal do Pará, 2023-01-30) DEMONER, Sarana Castro; ABREU, Carlos Henrique Medeiros de; http://lattes.cnpq.br/9009261156099636; https://orcid.org/0000-0003-0904-8791; TEIXEIRA, Marcelo Rassy; http://lattes.cnpq.br/8912916360456192The dynamics of rivers in the Amazon is predominantly linked to threats or natural events that may or may not trigger environmental damage. In March 2013 a large portion of soil slid into the interior of the Santana channel in Amapá, this abrupt mass movement took with it the Port of Santana and its respective facilities. The forensics findings identified a sensitive soil that had not previously been identified in Brazil. Due to the unusual behavior of the material on the shores of the Port of Santana, the new soil characteristics identified and because it is a port area, which houses several materials of great polluting potential, including bulk terminals, pipelines, the need arises to evaluate the behavior of a possible oil spill through hydrodynamic modeling. The software SisBaHiA® - Base System of Environmental Hydrodynamics was chosen to be used in the development of the models because it has a friendly interface and is already widespread in related lines of research. With the models and simulated scenarios, we identified the proportions of a new landslide accident involving these fuel reserves, the areas of the Santana channel that would be directly affected by the oil and what is the response time that the responsible institutions would have to trigger actions for mediation and containment of an accident of this proportion. Thus, the study seeks to obtain timely management mechanisms and decision-making about a possible accident.Item Acesso aberto (Open Access) O uso de Veículos Aéreos Não Tripulados (VANTs) para inspenções de segurança em barragens: estudo exploratório UHE Tucuruí(Universidade Federal do Pará, 2021-05-28) EL BANNA, Kamila Dias Bernardes; TEIXEIRA, Marcelo Rassy; http://lattes.cnpq.br/8912916360456192The main objective of this research is to verify the applicability of remote sensing by Unmanned Aerial Vehicles (UAVs), or popularly known as (drones) to aid in the safety of security in hydroelectric dams. It highlights the role and importance of technology as a means of innovation, for this application, as an exploratory study of the UHE Tucuruí. Some signs of deterioration or cracking, for example, can only be identified with visual inspections. For this reason, they are irreplaceable in dam safety control. In this context, the use of the UAV is very useful in these inspections, since its use makes this activity faster and safer, as it allows the verification of regions of the dam that are difficult to access, thus enabling full documentation of the dam's conservation status, in addition to the possibility of adapting sensors of different types and applicability, thus helping to provide more detailed information. The UAV, used for this research, satisfactory results for the evaluations to which it was exposed. Images with adequate quality and sequences were generated, so you can easily observe all the characteristics of the dam surface, thus providing a good support in the operation activities. In addition to supporting the dam safety assessment, the images generated can be gathered and used as a basis for other photographic surveys.