Journal of the Southern African Institute of Mining and Metallurgy
On-line version ISSN 2411-9717
KARAMPINOS, E.; HADJIGEORGIOU, J.; TURCOTTE, P. and MERCIER-LANGEVIN, F.. Large-scale deformation in underground hard-rock mines. J. S. Afr. Inst. Min. Metall. [online]. 2015, vol.115, n.7, pp. 645-652. ISSN 2411-9717. http://dx.doi.org/10.17159/2411-9717/2015/V115N7A11.
In some underground hard-rock mines, squeezing compressive ground conditions are influenced by the presence of rock foliation and high stress. In these cases, the orientation of the foliation with respect to the drift direction has a considerable impact on the magnitude of the resulting deformation. Irrespective of the reinforcement and support strategy, keeping drives developed sub-parallel to the rock foliation operational is difficult, and often requires excessive rehabilitation during the lifetime of the excavation. This study uses field observations and convergence measurements at the LaRonde and Lapa mines of Agnico Eagle Mines Ltd to provide guidelines of the anticipated squeezing levels at these operations.
Keywords : Squeezing ground conditions; large deformations; foliation; angle of drift interception; design guidelines.