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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2 resultados
Resultados da Pesquisa
Item Use of the distinct element method to study flexural toppling at the Pico Mine, Brazil.(2015) Pinheiro, Antônio Luiz; Lana, Milene Sabino; Sobreira, Frederico GarciaA stress–strain analysis studying flexural toppling failure in a phyllite mine slope at the Quadrila´tero Ferrı´fero, MG, Brazil is presented in this work. A numerical approach, the discrete element method, capable of representing discontinuous rock mass is used. The modeling of a discontinuous rock mass is complex and problematic. On theother hand, it better represents failure along discontinuities than do continuum techniques such as the finite element method. There are few studies using discontinuous modeling techniques to perform parametric and back-analyses of these types of mechanisms in weak and fractured rock mass. Therefore, the analyses herein can contribute to a better understanding of the geomechanical behavior of discontinuities, especially their stiffness. Also, the influence of in situ stresses in the failure mechanism is studied.Item Application of the discrete element method for modeling of rock crack propagation and coalescence in the step-path failure mechanism.(2013) Camones, Luis Arnaldo Mejía; Vargas Júnior, Eurípedes do Amaral; Figueiredo, Rodrigo Peluci de; Velloso, Raquel QuadrosThe present study evaluates the discrete element method (DEM) as a tool for understanding the step-path failure mechanism in fractured rock masses. Initially, the study simulates crack propagation and coalescence in biaxial and triaxial laboratory tests. The results of this analysis showthat the DEMaccurately represents these processes in comparison to other studies in the technical literature. The crack propagation and coalescence processes are important in the step-path failure mechanism for slopes. Simple examples of this mechanism were modeled, and their results were compared with those of the analytical model proposed by Jennings (1970). Among the possibilities suggested by Jennings,modelingwith DEMdid not provide a good approximation for the case of coplanar cracks, forwhich failures in the intact rock bridges should only be caused by shear forces. Inmodelingwith DEM, tensile failures occur within the sliding block, generating forces that are not considered in the Jennings model. The non-coplanar crack condition provided a better approximation, since the Jennings model formulation for this case includes the tensile failure of the rock. The main advantage of the DEM over other computational tools is its micromechanical representation of discontinuous media, which permits a better understanding of the step-path failure mechanism. However, good calibration of the macroscopic parameters of the rock and its discontinuities is necessary to obtain good results.