Role of Rock Mass Fabric and Faulting in the Development of Block Caving Induced Surface Subsidence |
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| Authors: | Alexander Vyazmensky Davide Elmo Douglas Stead |
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| Institution: | (1) Copper Projects Group, Rio Tinto Ltd., 354-200 Granville St., Vancouver, BC, V6C 1S4, Canada;(2) Mining Division, Golder Associates Ltd., Vancouver, Canada;(3) Department of Earth Science, Simon Fraser University, Vancouver, Canada |
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| Abstract: | Extraction of a large volume of ore during block caving can lead to the formation of significant surface subsidence. Current
knowledge of the mechanisms that control subsidence development is limited as are our subsidence prediction capabilities.
Mining experience suggests that, among other contributing factors, geological structures play a particularly important role
in subsidence development. A conceptual modeling study has been undertaken to evaluate the significance of geological structure
on surface subsidence. A hybrid finite/discrete element technique incorporating a coupled elasto-plastic fracture mechanics
constitutive criterion is adopted; this allows physically realistic modeling of block caving through simulation of the transition
from a continuum to a discontinuum. Numerical experiments presented emphasize the importance of joint orientation and fault
location on mechanisms of subsidence development and the governing role of geological structure in defining the degree of
surface subsidence asymmetry. |
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