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Physico-mechanical properties of the system syenite-enclave in the Královec quarry
Umlauf, Jiří ; Sluková, Michaela (referee) ; Krmíček, Lukáš (advisor)
The bachelor thesis focuses on mechanical properties of syenitoids and their mafic microgranular enclaves collected in actively mined quarry Královec near Jaroměřice nad Rokytnou. In overview part of the thesis are described selected methods for determining the physical-mechanical properties of the rocks as well as geology of the studied site. The practical part brings the results and principal conclusions from the measurements of the mechanical properties of these rocks.
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Correlations of parameters of selected rock types based on laboratory tests
Závacký, Martin ; Lahuta, Hynek (referee) ; Durmeková,, Tatiana (referee) ; Horák, Vladislav (advisor)
The dissertation thesis deals with the properties of hard rocks important for designing geotechnical structures, such as strength and deformation characteristics, as well as rock failure criteria. This work examines the possibility of using correlation relations to estimate the strength characteristics of rocks from index tests, which can make the rock testing process more efficient. The author described selected laboratory tests of rocks and identified several limitations of the tests procedures based on his own practical experience. The correlation analysis of an extensive data set and the derivation of regression relations for selected dependencies were performed. Furthermore, the rock strength estimation quality of the newly derived regressions was compared with the already published regressions. The analysis shows that the achieved degree of correlation is not sufficient to generalize the examined regressions. A significant reason of the low degree of correlation is the combination of the variability of rock properties and limitations of practical testing procedures. Thus, focus should be paid on calibration of the regression relationships within smaller areas in order to precisely estimate the rock properties as reliable input to the geotechnical design.
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The effect of temperature on the mechanical properties of greywacke
Brabec, Marek ; Horák, Vladislav (referee) ; Krmíček, Lukáš (advisor)
The author of this master's thesis studied the influence of high temperatures on Lower Carboniferous greywacke sampled in the Kobeřice quarry near Prostějov. Two sets of cylindrical bodies were produced, made of fine and relatively coarse-grained greywacke. The samples were then fired at temperatures up to 1200 °C. Thermally altered samples were then studied in laboratory using rock mechanics and petrography methods. Results of the study were then carefully interpreted to determine relations between the rock parameters, structural changes and the firing temperature. The master's thesis also contains a brief insight into rock thermomechanics, necessary theoretical background to the used methods and geological context of the Drahany Upland, where the samples of the tested greywacke were taken.
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Correlations of parameters of selected rock types based on laboratory tests
Závacký, Martin ; Lahuta, Hynek (referee) ; Durmeková,, Tatiana (referee) ; Horák, Vladislav (advisor)
The dissertation thesis deals with the properties of hard rocks important for designing geotechnical structures, such as strength and deformation characteristics, as well as rock failure criteria. This work examines the possibility of using correlation relations to estimate the strength characteristics of rocks from index tests, which can make the rock testing process more efficient. The author described selected laboratory tests of rocks and identified several limitations of the tests procedures based on his own practical experience. The correlation analysis of an extensive data set and the derivation of regression relations for selected dependencies were performed. Furthermore, the rock strength estimation quality of the newly derived regressions was compared with the already published regressions. The analysis shows that the achieved degree of correlation is not sufficient to generalize the examined regressions. A significant reason of the low degree of correlation is the combination of the variability of rock properties and limitations of practical testing procedures. Thus, focus should be paid on calibration of the regression relationships within smaller areas in order to precisely estimate the rock properties as reliable input to the geotechnical design.
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Physico-mechanical properties of the system syenite-enclave in the Královec quarry
Umlauf, Jiří ; Sluková, Michaela (referee) ; Krmíček, Lukáš (advisor)
The bachelor thesis focuses on mechanical properties of syenitoids and their mafic microgranular enclaves collected in actively mined quarry Královec near Jaroměřice nad Rokytnou. In overview part of the thesis are described selected methods for determining the physical-mechanical properties of the rocks as well as geology of the studied site. The practical part brings the results and principal conclusions from the measurements of the mechanical properties of these rocks.
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Railroad tunnel Praha-Beroun - as an example of underground structure in challenging karstic aresa
Belokopytov, Daniil ; Rott, Josef (advisor) ; Malát, Richard (referee)
This paper discusses impressive project of the tunnel between Prague and Beroun. The length of the structure, spreading up to 25 km, leads to need of overcoming many risks, which may the tunnel encounter. The text is focused on specific issues typical for areas built by karstic rocks, which generally present one of the most dangerous environment for building architectural projects of any kind. It concentrates on description of Bohemian karst and karstic features, which are likely to appear in studied area. It strives for delimintion of risks and suggestion of proper investigtion and remedition methods, suituable for given project. A part of the paper is a brief introduction into main tunneling technology, applicable for tunneling construction and discussion of possibilities of particular tunneling method.
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