Abstract

UMAR, S.B.; SJOBERG, J.  and  SAVILAHTI, T.. Modelling of caving and deformation mechanisms of the hangingwall of the Printzsköld oreboby at Malmberget mine. J. S. Afr. Inst. Min. Metall. [online]. 2017, vol.117, n.4, pp.351-360. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2017/v117n4a6.

Sublevel caving in Malmberget mine results in mining-induced surface deformation. One of the currently mined orebodies is the Printzsköld orebody. As mining deepens there is need to assess the behaviour of the cave formed in the subsurface above this orebody. Numerical analysis was used to assess the effects of extraction to deeper levels and perform strength parametric studies. Stress redistribution was studied, and the results showed high stress buildups in the hangingwall and the crown pillar. Two failure mechanisms have been identified - shear and tensile. Reducing cohesion by 50% increased the area of the yielded zone by more than 100% in the hangingwall.

Keywords : numerical modelling; sublevel caving; caving mechanism; strength parametric study; stress redistribution; hangingwall stability.

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