Simulating pillar reinforcement using a displacement discontinuity boundary element code
DOI:
https://doi.org/10.17159/Abstract
This study explores the use of a novel numerical modelling approach to study the effect of pillar reinforcement on pillar stability. Case studies in literature indicate that the installation of tendons, strapping of the pillars and shotcrete or thin spray-on liners are commonly used to reinforce pillars. No clear methodology exists to select the type of support or to design the capacity of the support required, however. This has led to ongoing collapses in some mines in spite of heavy support being used to reinforce unstable pillars. This paper explores a limit equilibrium model with confinement on the edge of the pillar to simulate the interaction of the support with the failing pillar. The model correctly predicts that an increase in confinement will lead to a decrease in the extent of pillar failure. As the displacement discontinuity boundary element method allows for the efficient solution of large-scale bord and pillar layouts, the effect of pillar confinement can now be studied on a mine-wide scale. Accurate calibration of the limit equilibrium model is, however, required before this method can be used for the design of effective pillar support.
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