Numerical Modelling Of The Yielding Of A Stabilizing Pillar/Foundation System And A New Design Consideration For Stabilizing Pillar Foundations

York, G.
Organization: The Southern African Institute of Mining and Metallurgy
Pages: 18
Publication Date: Jan 1, 1998
Following a short review of selected literature, a back analysis of stress measurements of stress regeneration in a closed mini-longwall is shown. The agreement is good, lending confidence to the parameters used in the proposed numerical model. Foundation yielding was modelled in the absence of total stope closure. A ?Prandtl? wedge was formed, coinciding with the yield point of the pillar/foundation system. Some theoretical work is used as a starting point for the formulation of a new design methodology for strike or dip stabilizing pillar/foundation systems in deep level goldmines. The existing guideline for the stability of foundations (APS< 2.5UCS) is critically examined. Finally, the advantages of the new approach, and the work required to substantiate the proposed new design methodology, are outlined.
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