Analysis and Methods of Controlling the Geodynamics Situation in the Mines of MMC Norilsk Nickel Group

In the process of deep thick ore deposit extraction the pressure of the overlying layers is exercised on preparation and extraction plots. This process includes both quasi-stationary slow movements and dynamic shifts, i. e. seismic activities. Dynamic phenomena in the vicinity of mining working may lead to their breakdown and loss of human lives.<br>Research on man made geodynamics process consists of a complex analysis of (1) the deposit tectonic structure, (2) mine surveying data on massif setting and (3) massif seismic activity.<br>Research effectuated in the mines of MMC Norilsk Nickel Group showed:<br>- Processes of setting and seismic activity are characterized by non-linear step-like events dependent on the activation of different faults where either quasi-stationary or dynamic forms of massif deformation are predominant. <br>- There exist two typical periods of seismic activity with spans of 1 or 2 years and of 2 or 3 months.<br>- When the space of mining is great there appear stable zones of high seismic activity linked to support pillars where mining is especially active.<br>- Together with the growth of seismic activity in these zones the slope of the repetition graph diminishes and powerful seismic events occur which are not subject to the repetition law.<br>The accepted method for diminishing the geodynamic hazard is hole off-loading at great spaces, which eases the ore stress throwing it off into the overlying and underlying strata.