Papers

Multi-scale discontinuum simulation of ground support design for large deformations

on Jun 12, 2012 in Downloads, Papers

Large deformations in deep mines occur due to the exposure of extensively damaged rock mass adjacent to an excavation. In order to properly simulate the support response in such conditions, the ground deformation must be captured accurately. The mechanisms of rock mass damage, dilation and deterioration must first be correctly simulated to produce a realistic tunnel deformation in three dimensions. Furthermore, the physical response of the support elements must be realistic. In this paper, a multi-scale, discontinuum approach to mine deformation modelling has been described to improve the...

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Application of a non-linear confinement sensitive constitutive model to mine scale simulations subject to varying levels of confining stress (LR2 model)

on Jun 12, 2012 in Downloads, Papers

Application of a non-linear confinement sensitive constitutive model to mine scale simulations subject to varying levels of confining stress (LR2 model)

V. Levkovitch, F. Reusch, Beck Engineering, Germany D. Beck, Beck Engineering, Sydney, Australia The Mohr failure envelope for rock materials is a convex curve strongly dependent on the level of confinement and truncated at low normal stresses. The most commonly applied failure criterion – the Mohr-Coulomb criterion – matches the observed failure envelope poorly. Using this criterion it is not possible to accurately describe rock failure over the whole range of expected confinement conditions for many prob-lems and instead the engineer must choose parameters that will be applicable over...

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3D Hydromechanical discontinuum simulation for pit slopes

on Jun 12, 2012 in Downloads, Papers

3D Hydromechanical discontinuum simulation for pit slopes

Beck, D., Reusch, F., Beck Engineering, Australia The assessment of slope stability does not frequently account for the interaction between stress, rock mass damage and water pressure and flow in a rigorous manner. Owing to improvements in computer capacity, it is now possible to undertake fully coupled or partially coupled, 3d hydromechanical Finite Element simulation of mines, including explicit representations of large numbers of discontinuities. The analysis requires fewer assumptions than uncoupled analysis or 2d analysis, but may require a change in how hydrological data is collected....

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A coupled DFE-Newtonian Cellular Automata scheme for simulation of cave initiation, propagation and induced seismicity

on Jun 12, 2012 in Downloads, Papers

A coupled DFE-Newtonian Cellular Automata scheme for simulation of cave initiation, propagation and induced seismicity

Beck, D., Beck Engineering Sharrok, G., The University of New South Wales, Sydney, Australia Capes, G., Newcrest Mining Limited, Orange, NSW, Australia Coupled, granular flow-deformation simulations have been undertaken at a number of caving operations to simulate cave initiation, propagation and gravity flow. The tool combines a Newtonian Cellular Automata (NCA) representation of the cave muckpile with an explicit Discontinuum Finite Element (DFE) model of the rock mass mine scale and incorporate high resolution input data such as large numbers of explicit structures in the rock mass and...

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Explicit discontinuum simulation for probabilistic forecasting of fault slip and rockmass seismicity

on May 18, 2012 in Downloads, Papers

D. Beck, V. Levkovitch, Beck Engineering, B. Simser, Xstrata Nickel, Nickel Rim South Mine, Sudbury, Canada With increasing depth, there will always be situations where stress, strength and structure combine to store energy in unstable ways around mining work areas. Some mining induced seismicity is unavoidable. The job of the planning team is to balance the compromises between production demands and rock mechanics driven sequencing principles so that all essential constraints – safety, economy and recovery – are met. Achieving a sufficient and defendable balance requires quantitative...

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