Investigation of surface subsidence due to sublevel caving

Authors: Villegas, T; Nordlund, E

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DOI https://doi.org/10.36487/ACG_rep/1002_10_Villegas

Cite As:
Villegas, T & Nordlund, E 2010, 'Investigation of surface subsidence due to sublevel caving', in Y Potvin (ed.), Caving 2010: Proceedings of the Second International Symposium on Block and Sublevel Caving, Australian Centre for Geomechanics, Perth, pp. 181-188, https://doi.org/10.36487/ACG_rep/1002_10_Villegas

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Abstract:
Mining with a sublevel caving induces the progressive failure of the hangingwall and in minor proportion the failure of the footwall. Surface subsidence is a consequence of the large deformation experienced by the rock mass. Monitoring displacement and fracture mapping are normally carried out in a regular basis especially when the mine is surrounded by civil and mining infrastructure. Since 1967, at Kiirunavaara mine, subsidence monitoring information has been obtained and used to calibrate predictive models. In this paper the monitoring data collected in Kiirunavaara mine is presented as time-displacement curves to analyse the pathway of the hangingwall and to predict displacements in short term. The results influenced by the quality of the rock mass, structural geology and stress conditions, shows different time-displacement behaviour along the hangingwall.

References:
Broadbent, C.D. and Zavodni, Z.M. (1982) Influence of rock structure on stability, in Proceedings 3rd International Conference in Surface Mining, Vancouver, AIME, Vol. 3, pp. 7–18.
Lupo, J.F. (1996) Evaluation of deformations resulting from mass mining of an inclined orebody, Doctoral Thesis, Colorado School of Mines, USA, 597 p.
Mercer, K.G. (2006) Investigation into the time dependent deformation behaviour and failure mechanisms of unsupported rock slopes based on the interpretation of observed deformation behaviour, Doctoral Thesis, University of the Witwatersrand, Johannesburg, South Africa.
Villegas, T. and Nordlund, E. (2008) Numerical Analysis of the hanging wall failure at the Kiirunavaara Mine, in Proceedings 5th International Conference and Exhibition on Mass Mining, MassMin 2008, H. Schunnesson and E. Nordlund (eds), Luleå University of Technology Press, Luleå, Sweden, pp. 867–876.




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