Navegando por Assunto "Dams"

Agora exibindo 1 - 5 de 5

Acesso aberto (Open Access)
Análise da adição de resíduos siderúrgicos em matrizes cimentícias para concreto massa
(Universidade Federal do Pará, 2021-12-17) BONFIM, Francirene Pereira; GOUVEIA, Fernanda Pereira; http://lattes.cnpq.br/1772072130947378
During the steel production process, industrial waste is generated, including granulated blast furnace slag and balloon powder, generated in the pig iron production stage; and electric arc furnace dust, obtained in the production stage of the steelworks. In the northern region, the highlight in steel production is SINOBRAS - Siderúrgica Norte Brasil SA, located in the municipality of Marabá-PA, which also experiences the problem of waste disposal, and therefore has been supporting partnerships with educational institutions in the region for expansion of destination alternatives. Thus, this research aims to evaluate the influence of waste from the SINOBRAS industry, granulated blast furnace slag (GBFS), balloon powder (BP) and electric arc furnace dust (EAFD) in cementitious matrices, predicting applications in mass concrete for dams . The research methodology was carried out in two stages, the first being directed towards the study of waste, analyzing its physicochemical and mineralogical characteristics, the pozzolanicity potential according to ABNT NBR 12653:2015, and classification according to the type of solid waste according to ABNT NBR 10004:2004. The second stage of the methodology comprised the analysis of cement matrices composed of the residues, combined with GBFS (GBFS70+BP30; GBFS50+EAFD50), in order to increase the potential performance of the properties verified for mass concrete, with compressive strength tests being carried out, setting times, heat of hydration and alkali-aggregate reaction. It was concluded in the residue study stage that BP and EAFD did not present pozzolanic properties, indicating that they are not interesting for applications of cementitious materials. As for the classification, the GBFS and the BP were classified as class IIA waste - non-hazardous and non-inert, while the EAFD was classified as class I - hazardous. In the second stage of the study, the EAFD combined with the GBFS showed pozzolanicity and the BP, even after combination, remained non-pozzolanic. Evaluating the combined cementitious matrices, the (GBFS50+EAFD50) obtained satisfactory results in all properties, since it promoted a reduction of heat of hydration by 7% and, consequently, an increase in setting times (about 6 hours), and mitigation of expansion reactions, in aggregates gravel and sand by 49%. and 75% respectively. Therefore, the use of the matrix GBFS50+EAFD50, in the studied content, can be a technically viable alternative for applications in mass concrete for dams, being necessary, however, to advance in the research, aiming to produce the concrete traces composed by the matrix combined (GBFS50+EAFD50).
Acesso aberto (Open Access)
Análise do impacto ambiental na área de influência das barragens de rejeito no município de Poconé-MT
(Universidade Federal do Pará, 2023-09-29) FERREIRA, Lorrana Dias; SILVA, Adriano Frutuoso da; http://lattes.cnpq.br/3321059172343690; https://orcid.org/0000-0003-1710-8862
Due to tragic accidents related to the failure of tailings dams in Minas Gerais, the disposal of tailings in dams has become an increasingly urgent topic of discussion, especially in relation to the risks associated with this approach. Consequently, mining companies have sought to implement alternative methods for managing tailings resulting from their operations. However, in this direction, the work analyzes the level of the environmental impact in the area of influence of tailings dams in the municipality of Poconé – MT, identifying the major damages that can be caused by a tailings dam rupture. To this end, maps of environmental impacts on the selected dams were created, using the software QGIS, also known as Quantum GIS. The Kernel method was also used, which is an analytical approach that is frequently applied in the assessment of risks and environmental sensitivity in relation to mining tailings dams. The results of the research revealed that throughout the work it was possible to observe that the mining tailings dams existing in the municipal limit of Poconé/MT are defined as structures that promote a “very high” environmental impact, mainly in the urban area than if it occurs the rupture could affect legal preservation areas and the city's drainage system, thus impacting the life of the community in general. With the data obtained, it was possible to analyze the environmental impact of tailings dams on local communities, including the possible relocation of families, access to drinking water and the health of people living nearby. Therefore, the analysis of the environmental impact in the area of influence of tailings dams in Poconé, Mato Grosso, is a crucial part of the responsible management process of mining activities, as it can help develop strategies to mitigate these impacts and ensure the protection of the environment.
Acesso aberto (Open Access)
Modelagem do rompimento e delimitação da área de inundação da barragem da Universidade Federal Rural da Amazônia em Castanhal-PA
(Universidade Federal do Pará, 2023-06-29) FONTES, Erick Alexandre de Oliveira; SILVA, Adriano Frutuoso da; http://lattes.cnpq.br/3321059172343690; https://orcid.org/0000-0003-1710-8862
Dams have structures that can cause changes over the years, which can cause changes in change processes, impacts, changes, changes in change processes, changes in the internal change process, changes in the change process, changes in the internal change process, changes in the process of change, changes in the process of internal change, overturning and others, the cause of which may come from natural phenomena or also from mismanagement. Thus, the experimental work presented as objective the objective of analyzing the hypothetical land located in the aquaculture station of the Universidade Federal Rural da Amazônia, in the municipality of objective Castanhal - PA. No methodological approach was used to simulate the flooding of the floodplain of HEC-RAS 5.0.3 (Hydrologic Engineers Corps – River System). The model software is based on the solution of permanent or non-permanent or two-dimensional Saint-Ven solutions, in version 5.3, considering the permanent regimes. The research numbers were observed from the simulation of the effects of the dam of results that were carried out: Seven, an information survey was carried out about the dam and an information survey was carried out with the ANA. A hazard implementation process is carried out afterwards and a report that this dam is nearing completion. Therefore, it is concluded in that study that the maintenance carried out in a severe way of materials and immaterial makes the impacts downstream, in front of the exposed, necessary to maintain the interdiction of the dam so that the maintenance of materials and emergency is necessary.
Acesso aberto (Open Access)
Proposta de inspeção de barragens através de um aplicativo para dispositivo móvel
(Universidade Federal do Pará, 2021-05-21) SANTOS JUNIOR, Evandro Lopes dos; SILVA, Adriano Frutuoso da; http://lattes.cnpq.br/3321059172343690; https://orcid.org/0000-0003-1710-8862
Ensuring safety and reliability in dams is a challenge for society, governments and especially for entrepreneurs who experience daily difficulties in maintaining the enterprise in good conditions of use during its life cycle. Today, technology is an indispensable tool for this to happen in view of the continuous need for the development and application of this tool in this branch of engineering. Thus, in order to contribute to the dam inspection process, the present work brings a proposal that innovates in the way the information is collected bringing the possibility of replacing the filling of a check list in a manual and traditional way to an automated way through a platform. simple and intuitive. This platform consists of an Android application. To do so, it was necessary to analyze the entrepreneur's manual on dam safety - volume II of the National Water Agency, study about mobile application development and define the application's functionalities to develop it. Then, studies were carried out on the programming language and the software for developing the tool on Android. One by one, the features of the App were built using a peculiar methodology for this, which revolves around the gear made up of research, testing and implementation. The developed application, called ISB, is a test version and has been subjected to emulations to verify its operation. Therefore, it was found that the application performed satisfactorily, avoiding flaws in the filling, and therefore in the safety assessment of the works surveyed.
Acesso aberto (Open Access)
Resistência e expropriação de famílias na Volta Grande do Xingu: o caso de duas áreas atingidas pela barragem de Belo Monte, Pará, Brasil
(Universidade Federal do Pará, 2013-05-28) MAIA, Ricardo Eduardo Freitas; GUERRA, Gutemberg Armando Diniz; http://lattes.cnpq.br/4262726973211880
This study made it possible to detail the mobilization against the construction of Belo Monte Hydroelectric Dam, from two distinct locations in Volta Grande do Xingu. Twenty six interviews have been made from May to July, 2012. The resistance against the construction of Belo Monte Dam spans over two decades, and it has gone through phases where there were position changes of the actors involved regarding the project, including the civil organizations. Regarding the peasants, these changes have dramatically influenced the way the conflict began, especially because their perception of the project depends upon the experience lived in the cited areas. In the municipality of São Raimundo Nonato and on the rural road connecting Ramal dos Penas, the mobilization turned possible due to the fear of changes, such as, losing their land and their production, the changes in their singular social relations grown in the area, the control in food production; however, such resistance emerged especially in those forced to leave the area, and the confrontations have been undermined fundamentally by the rapid social and environmental transformations after the beginning of the construction. In the areas named Ressaca, Garimpo do Galo and Ilha da Fazenda, one may notice that apart from the issues concerning the dam construction, there is the pressure as a result of the implementation of the mining project named Mineração Volta Grande. These expropriation fronts seem to increase even more the conflicts due to the changes in the construction area and the imminent displacement that may occur because of the mining project. Therefore, this study provides elements to the debate over other large investment projects that have undergone project or construction in the Amazon, followed by the peacemaking debate, the irreducibility in the construction, and consequently the natural displacement of residents for the progress and the common good, that overshadows lives and broaden social injustices.