The effect of shock waves from blasts in underground openings, induces damage in the adjacent rock-mass. This paper has the objective to evaluate the extension of this damage, applying a Holmberg and Persson's model-based methodology to the case of LAMIL Agalmatolite underground mine in Pará de Minas. Monitoring vibration particle velocities and P-wave propagation velocities, vibration limits were determined, above which, damage is expected to occur. Using the local near field scaled weight law, two radii of the damage zones around two classes of rock-mass were calculated: 0,24 m (critical damage radius) and 1,64 m (minimum damage radius) for Metarhyolite; and 1,29 m and 1,59 m, respectively, for Agalmatolite. Facing measured data with existing literature showed consistency with the values found for similar rocks. A comparison of the surveyed position of the excavated surface with that predicted by the model indicated an estimated medium error of 0,06 m.
explosives; vibration; blast; underground mine; damage
