Svensk titel: ANVÄNDNING AV GROUND PROBE GML LiDAR SCANNER FÖR ATT MÄTA RESPONSEN PÅ CEMENTERADE GRUVMATERIALBARRIÄRER UNDER ÅTERFYLLNINGEN AV BHP OLYMPIC DAM MINE
Light detection and ranging systems (LiDAR) have grown in popularity in recent years for the measurement of ground convergence over time in underground mines. These systems are typically used to manage geotechnical risk associated with rock mass displacement caused by mining induced stress redistribution. The Olympic Dam mine is a large poly-metallic underground mine located in South Australia, 550 km NNW of Adelaide. It is the fourth largest copper deposit and the largest known single deposit of uranium in the world. The GroundProbe Geotechnical Monitoring LiDAR (GML) system has been applied in a unique application at Olympic Dam mine to measure, with sub-millimetre accuracy, bulking/deflection as a result of the load experienced by a cemented mine fill barricade during backfilling. Many attempts have been made to model the capacity and response of cemented mine fill barricades in the past using complex non-linear numerical modelling methods which are required to model both plain and reinforced concrete behaviour (Grabinsky et al, 2014). The GroundProbe GML system measures surface displacement in near-real time with full spatial resolution and submillimetre range resolution. With this new technology, the aim of the project was to test and optimise existing backfill processes in the hope to increase the rate of fill placement hence permitting faster turnover of stopes and earlier access to adjacent mining blocks.