Integration of 3D numerical modelling and InSAR deformation monitoring to characterise block caving induced surface subsidence

摘要

Although the economic benefits of block caving are appealing, the mass extraction of ore inevitably causes significant ground deformations that may adversely affect sensitive infrastructure on surface. Sophisticated 3D numerical modelling has recently been employed as a means to help assess subsidence magnitudes, extent and impacts. At the same time, uncertainty and variability associated with geological heterogeneity and rock mass properties results in model uncertainty and the need for models to be calibrated and constrained. This study examines the use of 3D numerical methods for modelling block caving induced surface subsidence and means to calibrate and constrain these complex models. The latter is addressed through the use of high-resolution satellite Interferometric Synthetic Aperture Radar (InSAR) data acquired through Canada's second generation radar satellite, RADARSAT-2. Preliminary results are presented for a detailed multi-disciplinary study involving the Palabora block cave mine in South Africa.