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Local hydrogeology of the PLA Blanský les
Čečka, Jan ; Ondovčin, Tomáš (advisor) ; Čurda, Jan (referee)
The protected landscape area of Blanský forest is located in the region of South Bohemia, 12 kilometres south-west from the town of České Budějovice. Its geological environment consists of the granulite massif Blanský forest including a lot of bodies of ultramafic rocks - serpentinised peridotites, then we find gneisses of varied unit of Český Krumlov with many different types of rocks - crystalline limestones (marbles), amphibolites, quartzites and graphitic parts. This bachelor thesis aims to sum up as much hydrogeological data and knowledge about the area as possible. It presents characteristics of the hydrogeological environment like disposition of rocks to transport groundwater due to the influence of weathering, fissured zones and tectonic deformation. In its next part this thesis quantifies the hydraulic properties of present rocks by the number of the order of transmissivity magnitude Y and compares these results from pumping tests with theoretical opinions mentioned above. It also considers chemical and physical properties of qroundwater, the influence of mining and the water resources treatment. There are presented field data from hydrogeological mapping too. As the last part of this thesis, hydraulic and other data from hydrogeological boreholes which have been drilled until this time...
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Summary of foreign knowledge about the origin and development of EDZ in crystalline rocks - research
Vavro, Martin ; Souček, Kamil ; Staš, Lubomír ; Vavro, Leona
Presented search summarizes findings of foreign research oriented on the origin and evolution of the excavation damaged zone in crystalline rocks with a particular focus on the essential results of experimental projects which were performed in Canada, Sweden, Finland, and Switzerland. The study is divided, excluding the introduction, into seven main chapters of the text, which gradually deal with: (1) definition of key terms, (2) overview of the main underground research laboratories in the world where EDZ assessment was conducted, (3) methods suitable for EDZ description and characterization, (4) main factors influencing the origin of failure around the excavations and time-dependent evolution of EDZ. An overview of important outcomes of EDZ experiments, focusing on the European hard rock laboratories (Stripa, Äspö, Onkalo/Olkiluoto and Grimsel), and their summary are presented in the final two chapters.\nThe review summarizing the published key findings and results of in situ experiments shows, that for rock in lower stress state, i.e. in no spalling environment, the extent and character of rock mass damage is typically dependent on the excavation method. Using mechanical excavation, rock damage zone with thickness less than 3 centimeters can be originated. The microcracks within this zone contribute to the increase of hydraulic conductivity of the rock mass. At some test sites (Äspö, Grimsel), where the tunnel boring machine technology was used, the damage zone was already detected in depth of less than 5 mm.\nOn the contrary, openings excavated by drilling and blasting are characterized by much more extensive damage zones up to several tens of centimeters in width. The damage progressively diminishes with the distance from the opening.
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