Numerical Analysis of Block Caving-Induced Instability in Large Open Pit Slopes: A Finite Element/Discrete Element Approach |
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Authors: | Alexander Vyazmensky D Stead D Elmo A Moss |
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Institution: | (1) Copper Projects Group, Rio Tinto Ltd., 354-200 Granville St., Vancouver, BC, V6C 1S4, Canada;(2) Department of Earth Science, Simon Fraser University, Vancouver, BC, Canada;(3) Mining Group, Golder Associates Ltd., Greater Vancouver Office, Burnaby, BC, Canada |
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Abstract: | This paper addresses one of the most challenging problems in mining rock engineering—the interaction between block cave mining
and a large overlying open pit. The finite element modeling/discrete element modeling (FEM/DEM) approach was utilized in the
analysis of block caving-induced step-path failure development in a large open pit slope. The analysis indicated that there
is a threshold percentage of critical intact rock bridges along a step-path failure plane that may ensure the stability of
an open pit throughout caving operations. Transition from open pit to underground mining at Palabora mine presents an important
example of a pit wall instability triggered by caving. Using combined FEM/DEM-DFN (discrete fracture network) modeling, it
was possible to investigate the formation of a basal failure surface within an open pit slope as a direct result of cave mining.
The modeling of Palabora highlighted the importance of rock mass tensile strength and its influence on caving-induced slope
response. |
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Keywords: | |
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