Authors: Dehkhoda, S; Reusch, F; Putzar, G

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Dehkhoda, S, Reusch, F & Putzar, G 2023, 'A numerical approach for a displacement-based ground support capacity consumption forecast', in J Wesseloo (ed.), Ground Support 2023: Proceedings of the 10th International Conference on Ground Support in Mining, Australian Centre for Geomechanics, Perth, pp. 573-590,

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The evolution and timing of discontinuous rock mass deformation is critical in evaluation of capacity consumption in individual support elements and overall performance of the support system. Ground support and reinforcement are installed in a strain free, or at a specified load condition (i.e. prestressed), into a deformed, discontinuous rock mass. The subsequent additional loads that develop in the support system are caused by additional displacements within the rock mass and the resultant forces generated by (i) blocks and wedges that would otherwise be kinematically free to fall or slide, and (ii) deformation of the continuum rock material between the discontinuities. Hence, the interaction between the support elements and the rock mass is complex and non-linear beyond the point of yield. This paper reports on a numerical modelling technique that forecasts and assesses performance of ground support systems over the life of underground mining excavations. Simulating a support system in a discontinuous rock mass subjected to mining-induced stress and strain path, the authors have developed a methodology that tracks the consumed and the remaining capacity of the individual support elements within the system as loading demand increases. By providing a quantitative tool to assess performance of the support system over the life of mine, the outcome assists the mines to set guides to when and where preventative measures will be required. The results combined with closure forecast data also allow identifying high-risk areas and deformation trigger levels beyond which entry into an excavation with a particular support design would need to be reviewed. The modelling technique, set up and results are discussed in full within the paper.

Keywords: numerical modelling, ground support performance, capacity consumption

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