INFLUENCE OF WIDTH AND HEIGHT OF ROOMS ON MICROSEISMIC ACTIVITY IN POTASH MINES
Mining of Russia’s largest Upper Kama potash salt reserves is associated with plenty of adverse events with disastrous effects sometimes. One of the hazardous deformation rate indicators effective for nearly real-time deformation monitoring is microseismicity. For instance, seismological monitoring of the Upper Kama potash salt mines was launched in 1995 and is being continued up to this date. The long-term observations show that variations in seismic activity in space and time are closely connected with geotechnical parameters of mines. One of the key geotechnical parameters is the size of rooms (width and height) to be selected based on geological conditions of mining and capacities of equipment. The study of the room width effect on microseismic activity reveals a low correlation of these two parameters (on average ≈ 0.5) in terms of all seismic events within a mine. At the same time, the geometrical parameters of rooms have influence on possible energy ranges of the rockfall-type seismic events. In the latter case, a linear relation is found between the maximum moment magnitude and the room geometry. Thus, with the a priori known width and height of rooms as well as mine layouts, it is possible to assess beforehand the maximum possible magnitude of future seismic events of the rockfall type.
For citation: Zlobina T. V. Influence of width and height of rooms on microseismic activity in potash mines. MIAB. Mining Inf. Anal. Bull. 2019;(8):136-145. [In Russ]. DOI: 10.25018/0236-1493-201908-0-136-145.
: Zlobina T. V.
Zlobina T.V., Engineer, e-mail: email@example.com, Mining Institute
of Ural Branch, Russian Academy of Sciences, 614007, Perm, Russia.Key words
Potash mine, mining systems, room width and height, seismological monitoring, seismic events, rockfall, microseismic activity.References
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