Influence of water content on seismic activity of rocks mass in apatite mining in Khibinyстатья
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Дата последнего поиска статьи во внешних источниках: 12 июня 2024 г.
Аннотация:The authors analyse a connection between the rock mass water content due to surface water (precipitation, snow melting and water bodies) and rockburst occurrence in mines. The seismological monitoring performed from 2001 at the surroundings of the Apatitovy Tsirk and Plato Rasvumchorr apatite deposits has identified fluctuation of the general seismic background from year to year and seasonably. For these deposits, increased water content of rocks is seen as a natural trigger for rock mass seismicity during intensive rains and snow melting. The 15-year seismic monitoring of the apatite deposits under study has revealed regularity in a seasonal growth of seismicity during snow melting and precipitations, mainly in spring months. Particularities of geodynamical events occurrence allow a conclusion on an ultimately stressed state of the upper part of the earth’s crust in a whole at the deposits’ vicinities. Reactivation of tectonic disturbances and weakened rock mass zones occurring due to relieving their normal stress during infiltration can be a potential principal mechanism of seismic activation of the rock mass during the increased water content periods.
The origin of the events observed is linked with the dynamic realization of ultimately stressed rock mass state when changing geomechanical conditions under impact of hydrostatic pressure on tectonically disturbed zones.
The authors make a conclusion on necessity to apply the revealed regularities of impact of natural factors on rockburst hazard when planning mining operations and performing geomechanical monitoring.