Mining Institute of Scotland (MIS)

Norman Henderson Memorial Lecture - online

Synopsis: The first part of the lecture will explore the probabilistic 3D kinematic analysis of underground excavations. In this section, we will look at how discrete fracture network modelling is used to represent complex fracture systems more realistically, how unstable blocks are identified around intricate excavation geometries, and how probability-based heat maps (such as block occurrence, block failure percentages, apex heights, and support pressure requirements) help inform ground support design. This part emphasises how modern structural data collection and DFN workflows significantly reduce assumptions and improve the reliability of design decisions in challenging underground environments. The second part of the lecture will then shift focus to the coupled DFN–Limit Equilibrium approach for assessing large scale slopes. Here, we will delve into how integrating stochastic and deterministic structural models enables the evaluation of composite failure mechanisms involving rock mass and major/minor structures. We will also discuss calibration against historical instabilities, the use of block failure heat maps as a proxy for probability of failure, and how sensitivity analyses help interpret structural uncertainties across different geotechnical domains. This section will highlight how the methodology provides a more robust predictive tool for inter ramp and wall scale slope design, especially in structurally complex porphyry systems. Speaker Biography: Steve Rogers is a Senior Principal Geoscientist and geomechanics WSP-Golder in Vancouver, Canada. He has a degree in Geology & Management Science from Keele University and a PhD in mining rock mechanics from Nottingham University. Steve has been one of the leading advocates for the application of Discrete Fracture Network (DFN) technology to mining issues including slope stability assessment, rock mass characterisation and cave mine assessments, fragmentation prediction, and fractured rock hydraulics. Pedro Ojeda has 17 years of experience in the field of geotechnical engineering and rock mechanics. Pedro has focused on geotechnical and structural characterization of rock masses, open pit slope stability analysis and design, and discrete fracture network (DFN) modelling. He has worked on a variety of mining projects throughout South America, North America, and Australia. Please note that this meeting will be held online only. joining details in the flyer. In association with teh British Geotechnical Association.
   

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