Examinando por Autor "Montoya-Noguera, Silvana"

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    Modeling added spatial variability due to soil improvement: Coupling FEM with binary random fields for seismic risk analysis
    (Elsevier Ltd, 2018-01-01) Montoya-Noguera, Silvana; Lopez-Caballero, Fernando; Mecánica Aplicada
    A binary mixture homogenization model is proposed for predicting the effects on liquefaction-induced settlement after soil improvement based on the consideration of the added spatial variability between the natural and the treated soil. A 2D finite element model of an inelastic structure founded on a shallow foundation was coupled with a binary random field. Nonlinear soil behavior is used and the model is tested for different mesh size, model parameters and input motions. Historical evidence as well as physical and numerical modeling indicate that improved sites present less liquefaction and ground deformation. In most cases this improvement is modeled as homogeneous; however, in-situ measurements evidence the high level of heterogeneity in the deposit. Inherent spatial variability in the soil and the application of some soil improvement techniques such as biogrouting and Bentonite permeations will necessary introduce heterogeneity in the soil deposit shown as clusters of the treated material in the natural soil. Hence, in this study, improvement zones are regarded as a two-phase mixture that will present a nonlinear relation due to the level of complexity of seismic liquefaction and the consequent settlement in a structure. This relation is greatly affected by the mechanical behavior of the soils used and the input motion. The effect on the latter can be efficiently related to the equivalent wave period as the proposed homogenization model depends on the stiffness demand of the input motion. © 2017 Elsevier Ltd
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    Proceso de ASC - CARACTERIZACION MECANICA DE LOS RESIDUOS MINEROS Y EVALUACION DE LA SUSCEPTIBILIDAD A LA LICUACION ESTATICA Y DINAMICA DE LAS PRESAS DE RELAVES MINEROS DE BURITICA Y CERRO MATOSO.
    (Universidad EAFIT, 2022) Ortega, Jorge David; Yela Burbano, Diana Fernanda; Montoya-Noguera, Silvana; Universidad EAFIT
    In mining projects, around 50 thousand tons of rock are extracted per day, where each ton, 5 grams or less of gold are obtained, the remainder is known as tailings. These waste are stored in more than 18,000 tailings dams in the world with a capacity of around 200 million tons each (Lyu et al., 2019). It is important to mention that throughout history, serious accidents have occurred due to the failure of these structures, since there are 6 to 14 times more likely to fail than water reservoirs (Emerman, 2018). Since tailings are loose and saturated, they are susceptible to liquefaction. The objective of this project is to understand how liquefaction works in these materials, through field visits, the characterization of behavior in the laboratory and, finally, improve the vibrating table to visualize liquefaction in these soils. The results of this project have been disseminated to through the social networks of the seedbed on Instagram as a product of citizen participation, A technical day on mining tailings was also organized at the EAFIT University with the support of the specialization in Soil and Foundation Mechanics and the company SRK. Also I know will present a dissemination article in the Social Appropriation of Knowledge (WP) format. These results raise awareness in the academic community and society about mining tailings and the importance of research to mitigate future disasters in the industry.