Authors: Banjwa, P; Andrews, PG; Morkel, IG

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DOI https://doi.org/10.36487/ACG_repo/2465_82

Cite As:
Banjwa, P, Andrews, PG & Morkel, IG 2024, 'The effectiveness of preconditioning: utilising mXrap for analysing data and transforming raw scans into a functional database', in P Andrieux & D Cumming-Potvin (eds), Deep Mining 2024: Proceedings of the 10th International Conference on Deep and High Stress Mining, pp. 1253-1264, https://doi.org/10.36487/ACG_repo/2465_82

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Abstract:
Preconditioning in mining face areas prone to strainbursting is one of the most effective controls available to the geotechnical engineer. Although historical studies have focused on conventional narrow-reef tabular mining, the same outcomes can be assumed for high-profile de-stress excavations as utilised at Gold Fields’ South Deep mine, i.e. 6 × 5.5 m (width to height). As a concept, preconditioning dates to the early 1950s, indicating its longstanding relevance in mining operations. South Deep utilises a face perpendicular preconditioning technique which is 1.5 m longer than the normal blast round. In contemporary mining operations, the effective utilisation of data plays a pivotal role in enhancing safety protocols and operational efficiency. This paper delves into the use of an IGM Geotechnical (IGM) mXrap application for visualising (the interface) and analysing data collected underground using the Sub-Surface Profiler (SSP). The application specifically focuses on transforming raw scans into functional data, which helps in assessing the effectiveness of face preconditioning. Through a combination of case studies (including the use of borehole cameras in the calibration phase) and theoretical analysis, the tangible benefits of employing the IGM application/mXrap, including improved accuracy, reduced processing time and enhanced decision-making capabilities for determining face preconditioning accuracy using a non-invasive method like the SSP, are showcased. Additionally, the integration of mXrap into existing mining frameworks is discussed and potential avenues for further development are highlighted. The findings presented underscore the significance of leveraging technology to optimise preconditioning processes and procedures to pave the way for a safer and more efficient mining operation.

Keywords: preconditioning, de-stress, Sub-Surface Profiler, scans, surveys, borehole camera, borehole logging, database, mXrap

References:
Gouvea, JP & du Plessis, M 2022, ‘Developing a Severity Index to account for seismic induced damage in a deep level mine’, ISRM IX Latin American Rock Mechanics Symposium, Asuncion.
Heal, D, Hudyma, M & Potvin, YH 2006, Evaluating Rockburst Damage Potential in Underground Mining, The 41st U.S. Symposium on Rock Mechanics – 50 Years of Rock Mechanics - Landmarks and Future Challenges, American Rock Mechanics Association, Alexandria.
Kgarume, T, van Schoor, M & Nontso, Z 2019, ‘The use of 3D ground penetrating radar to mitigate the risk associated with falls of ground in Bushveld Complex platinum mines’, Journal of The Southern African Institute of Mining and Metallurgy, vol. 119, pp. 973–982.
Markovaara-Koivisto, M, Hokkanen, T & Huuskonen-Snicker, E 2014, ‘The effect of fracture aperture and filling material on GPR signal’, Bulletin of Engineering Geology and the Environment, vol. 73, no. 3, pp. 815–823.
Ortega, O, Marrell, R & Laubach, SE 2006, ‘A Scale-independent approach to fracture intensity and average spacing measurement’, AAPG Bulletin, vol. 90, no. 2, pp. 193–208.
Persico, R 2014, Introduction to Ground Penetrating Radar Inverse Scattering and Data Processing, GPR Systems and GRP Signals, John Wiley & Sons, Inc., Hoboken.
Reutech Mining 2022, Sub Surface Profiler Case Study – Using GPR to Assess the Extent of Face Pre-conditioning Through Mining Mesh, internal report, pp. 6–9.
Toper AZ, Kabongo, KK, Stewart RD & Daehke A 2000, ‘Mechanism, optimization, and effects of preconditioning’, Journal of The Southern African Institute of Mining and Metallurgy, vol. 100, no. 1, pp. 7–16.
Toper, AZ, Stewart, RD, Kullmann, DH, Grodner, M, Lightfoot, N, Janse van Rensburg, AL & Longmore, PJ 1998, Develop and Implement Preconditioning Techniques to Control Face Ejection Rockbursts for Safer Mining in Seismically Hazardous Areas, CSIR Division of Mining Technology, SIMRAC final report, Project GAP336.




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