1887

Abstract

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.

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/content/papers/10.3997/2214-4609-pdb.20.C029
2006-10-16
2020-10-25
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609-pdb.20.C029
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