National Repository of Grey Literature 5 records found  Search took 0.01 seconds. 
4D Characteristics of Electric Resistivities and Elastic Parameters of Crystalline Rock Massif
Jirků, Jaroslav ; Vilhelm, Jan (advisor) ; Hartvich, Filip (referee) ; Valenta, Jan (referee)
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...
Geoelectrical and seismic investigations for assessment of rock massif in neighbourhood of excavation
Jirků, Jaroslav ; Vilhelm, Jan (advisor) ; Mikšová, Jitka (referee)
The processing and the interpretation of the geophysical data measured by the author of this thesis in the Bedřichov gallery (municipal of Liberec) is the main goal of this diploma paper. Earlier data measured in the gallery by G IMPULS Praha spol. s r.o. staff members in the period between 2003 and 2010 are further used to support the assessment. The tunnel which serves to convey water from the Josefův Důl storage reservoir to the water treatment plant in Bedřichov is driven in the granites. These rocks are considered as a highly appropriate host medium for the future deep repository of radioactive wastes in the Czech Republic hence the gallery could be an appropriate place for testing of geological, geotechnical and geophysical methods for purposes of deep repository. The tunnel was driven using two different methods, which allows assessing of the impact of the driving type on the rock disturbance. The tunnel is open for a similar period, which is being considered between the start of operation and the closure of the deep repository hence it's possible to consider time-changes in the goaf. First chapters of this thesis present a brief insight into the problems of the development of the nuclear waste deep repository. The results of the measurements, which are interpreted in this diploma paper, were carried...

See also: similar author names
3 Jirků, Jakub
3 Jirků, Jan
1 Jirků, Jana
4 Jirků, Jitka
2 Jirků, Jiřina
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