Geotechnical role models and the delivery of geotechnical expertise

Authors: Mawson, M; van As, A; Wimmer, M Download Paper

Cite As:
Mawson, M, van As, A & Wimmer, M 2024, 'Geotechnical role models and the delivery of geotechnical expertise', in Daniel Johansson & Håkan Schunnesson (eds), MassMin 2024: Proceedings of the International Conference & Exhibition on Mass Mining, Luleå University of Technology, Luleå, pp. 1644-1654.



Abstract:
LKAB operates four iron ore mine sites using Sub-Level Cave (SLC) and open pit mining methods. Traditionally its geotechnical models were absent, however, it now has developed a geotechnical data collection and modelling system at scale using the latest geotechnical methods of collection and modelling. Until development at greater depths and stress-related instability became an issue, no need existed for a geotechnical model. Classification system papers are available - thus logging is reverse-engineered from the system used - with well-described case studies. However, the overall what and why of the doing needs help from experience. LKAB engaged and learned from experienced geotechnical expertise, bridging the gap of raw data to knowledge with lessons learnt – including the 90 million tonne (Mt) stable pillar in Block 22. The development of a geotechnical model is well described by Read and Stacey (2009). In the last three years, LKAB systematically generated the primary data needed to make reliable geotechnical models - with the help of external experts and the development of an in-house team. The in-house team learned from the consultants engaged in the set-up of the system and learnt lessons from the problems encountered along the way - and the solutions needed. This paper provides a discussion of the overall components of the LKAB geotechnical model, describes LKAB’s geotechnical system with major lessons learned, and concludes with an assessment from one of the end-users of the final geotechnical product.