Study of the hydrogeological responses to mass explosions during mining at the iron ore deposit

The results of precision monitoring of the groundwater level are used as the main criterion in study of the mechanism of deformation of a water-saturated reservoir under dynamic impact. The purpose of the field investigation is a registration of the hydrogeological responses to the passage of seismic waves from mining of the iron ore deposit. An instrument-measuring complex of autonomous synchronous registration of seismic signals and hydrogeological responses to mass explosions during underground and surface mining was installed at the site of the iron ore deposit. For the first time, the amplitudes and frequency ranges of the hydrogeological responses of the different aquifers were determined in the near field zone. During mass explosions has been previously established that the reaction of aquifers to explosions is faster than the displacement of soil on the surface. The hydrogeological responses in the water-saturated sands, slates and quartzites are registered at the different frequencies. The change of the reservoir filtration properties under the mass explosions are not possible to judge due to the lack of a long series of observations. Only the continuation of the precise hydrogeological monitoring allows receiving a new data of the deformation of a water-saturated reservoir of pore and pore-fracture types under high-intensity exposure have been obtained. Probably these results can be used for the understanding of the hydrogeological and hydrogeomechanic processes in the near field of earthquakes. The reported study was funded by RFBR according to the research project № 19-05-00809.