Back-analysis of PC1 cave propagation and subsidence behaviour at the Cadia East mine

Authors: Sainsbury, B; Sainsbury, D; Carroll, D

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DOI https://doi.org/10.36487/ACG_rep/1815_10_Sainsbury

Cite As:
Sainsbury, B, Sainsbury, D & Carroll, D 2018, 'Back-analysis of PC1 cave propagation and subsidence behaviour at the Cadia East mine', in Y Potvin & J Jakubec (eds), Caving 2018: Proceedings of the Fourth International Symposium on Block and Sublevel Caving, Australian Centre for Geomechanics, Perth, pp. 167-178, https://doi.org/10.36487/ACG_rep/1815_10_Sainsbury

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Abstract:
Based on the successful initiation and breakthrough to surface of the PC1 cave at Cadia East, a backanalysis of the performance was conducted to confirm design parameters to optimise the future draw strategy. A minescale numerical model was developed to calibrate the existing caving and subsidence behaviour associated with the initiation of PC1 and development of the crater. The successful calibration of historical conditions has provided significant confidence in the caving and subsidence predictions associated with future draw strategies. It has also validated a methodology to simulate the effects of preconditioning in large-scale models.

Keywords: caving, subsidence, PC1, Cadia East, numerical modelling, preconditioning

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