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6 Abstract (ENG) The thesis deals with the use of geophysical methods for non-invasive monitoring of geological processes occurring in crystalline massifs. Such a methodology can be used, for example, in monitoring the processes in future and existing deep geological repositories. The main geophysical methods monitoring changes in the rock mass are multielectrode electrical resistivity tomography (ERT) and high-frequency seismics. Monitored parameters that change over time are the apparent electrical resistivity and parameters of excited elastic waves. Based on long-term measurements at the field bases, changes in the rock mass are described. Interpretations of such changes are made using our own laboratory measurements quantifying the effect of groundwater saturation of samples and the effect of sample disruption (mechanical / thermal) on their electrical resistivity. With respect to modelling and interpretation of the apparent resistivity cross-sections the sensitivity function calculation was proposed and carried out in the geometry of used field layout. It was proven that seismic transmission may be carried out in an underground work reliably for long time. Seismic measurement shows that in the environment of underground works excavated decades ago, we practically do not observe any changes in the... |
