Visualisation of elastic numerical modelling results for effective mine planning and design

Kobus du Plooy, Frans Basson
2012 Proceedings of the Sixth International Seminar on Deep and High Stress Mining   unpublished
One of the challenges that geotechnical engineers are faced with today is how to present numerical modelling results in an effective manner. The elastic BEM software, Map3D-SV, has been the trustworthy stress modelling software of choice to operational and consulting geotechnical engineers for many years. Through a process of back analysis, elastic modelling stress results can be effectively used on mines where rock stresses contribute to observed failures. Conceptual Map3D models also provide
more » ... seful insights into the likely stress distribution around underground excavations that can be used to direct mine planning from conceptual study through to the operational phase. Map3D results are typically displayed as flat contoured surfaces on grids placed at the area of interest. This has proved to be largely ineffective when the aim is to capture the volumetric implications in a three dimensional mining environment. Other visualisation techniques such as iso-surfaces and colour mapping of results on excavation surfaces are far superior, but not yet supported in the Map3D-SV. This paper discusses visualisation techniques and demonstrates potential application areas for each: 1. Iso-surfaces from modelling results: a. crude iso-surfaces in Map3D b. detailed iso-surfaces using other software packages (Voxler, 2011; Leapfrog, 1997 Leapfrog, -2011 GoCAD, 2011) . Colour mapping of surfaces from modelling results: a. colour mapping surfaces from a cloud of result points (Leapfrog, 1997(Leapfrog, -2011 or GoCAD, 2011) b. mapping of spatially selected results to excavation surfaces (specific process in REM3D, 2011). Excavation surfaces can be colour mapped according to results from points generated at a predetermined density, and a fixed distance from excavation surfaces for detail. The visualisation techniques discussed in this paper have been found useful in both feasibility studies and operational investigations. They are superior to flat contours in many instances, but especially where a global understanding of the stress impact, or the selected design criterion, is required. Other benefits that flow from these techniques are:  Iso-surface triangulations can be exported and provided to planning engineers for design guidance.  Colour mapped results on excavation surfaces can be easily related to observed behaviour in underground openings.  Two dimensional numerical modelling data can be viewed in combination with three dimensional data.
doi:10.36487/acg_rep/1201_25_duplooy fatcat:ce4rrxnyyfcntewjjzdjsotmym