EM - Escola de Minas
URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/6
Notícias
A Escola de Minas de Ouro Preto foi fundada pelo cientista Claude Henri Gorceix e inaugurada em 12 de outubro de 1876.
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Resultados da Pesquisa
Item Electrokinetic dewatering of mine tailing : infuence of solid content and voltage level applied.(2022) Ferreira, Lucas Deleon; Gomes, Romero César; Ferreira, Ana CarolinaThe process of disposing the tailings from mining activities generally involves the construction of large storage structures, either because of the large volume of residue generated by industrial processing plants or the difculties in obtaining grants for new disposal areas. Over the past few years, such storage structures have been maximized to astonishing dimensions, considerably increasing the risk associated with possible rupture. Therefore, new management techniques, such as the integration of several mining areas involved in the exploration, and processing and residue disposal, need to be developed for reducing the generated residue volume and for optimizing the disposal processes of such materials. One of the residue disposal methodologies currently under study is the acceleration of the dewatering/consolidation process of the so-called fne residues, using electrokinetic techniques. In this context, this study conducts electrokinetic dewatering tests on fne bauxite tailing, using samples with initial solid content by weight ranging from 20 to 30%; fnal values between 43 and 66% are achieved. The estimated power consumption per volume of drained water ranges from 31.4 to 375.2 kWh/m3 . The obtained results establish that the utilization of electrokinetic processes in the dewatering of tailings is a technique worthy of further investigation.Item Numerical solution for consolidation and desiccation of soft soils.(2002) Yao, Daniel T. C.; Oliveira Filho, Waldyr Lopes de; Cai, Xiao Chuan; Znidarcic, DobroslavThe consolidation and desiccation behaviour of soft soils can be described by two time-dependent nonlinear partial differential equations using the finite strain theory. Analytical solutions do not exist for these governing equations. In this paper, we develop efficient numerical methods and software for finding the numerical solutions. We introduce a semi-implicit time integration scheme, and show numerically that our method converges. In addition, the numerical solution matches well with the experimental result. A boundary refinement method is also developed to improve the convergence and stability for the case of Neumann type boundary conditions. Interface governing equations are derived to maintain the continuity of consolidation and desiccation processes. This is useful because the soil column can undergo desiccation on top and consolidation on the bottom simultaneously. The numerical algorithms has been implemented into a computer program and the results have been verified with centrifuge test results conducted in our laboratory.Item Formulação numérica, via MEF, de problemas de adensamento considerando a variação do nível d'água.(2005) Pinto, Marcelo Antônio Furtado; Nogueira, Christianne de LyraEsse artigo apresenta a formulação isoparamétrica, via MEF, de problemas de adensamento devido à variação do nível d'água em termos das variáveis primárias: deslocamentos e carga hidráulica total. A superfície livre, durante o regime de escoamento transitório, é considerada como um contorno móvel e, para sua localização, é adotado o processo de fluxo residual. A estratégia de redução da permeabilidade, necessária para minimizar o fluxo nas regiões com poro-pressões negativas, foi adotada nesse artigo. O modelo numérico apresentado foi implementado no programa computacional ANLOG para solução de problemas em estado plano de deformação. São apresentados exemplos que validam a formulação apresentada.