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The assesment stability of the cliff
Bíba, Tomáš ; Lossmann, Jaroslav (referee) ; Horák, Vladislav (advisor)
The stability of rock walls and slopes are an integral part of professional geotechnical assessment wherever there is a breach of natural or rock mass. Assessment always depends on the expertise and experience in particular industries that report preparation. Performed mostly analytical calculation (classic or using software) or numerically. The best way is to use both methods and compare them. The aim is always best to estimate the behavior of rock mass and to ensure its safety.
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Design of CNC lathe milling head with adjustable tilt
Horák, Vítězslav ; Pavlík, Jan (referee) ; Tůma, Jiří (advisor)
This thesis deals with design of CNC lathe milling head with B axis. Thesis includes research in CNC turning machines, their tool systems and overview of manufacturers of milling B axis. It also includes calculation of machining forces, design of spindle and design of B axis including necessary calculations. Part of this thesis is also 3D model and assembly drawing, 2 manufacturing drawings and list of items.
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Technical gallery under the railway
Michaljaničová, Jana ; Horák, Vlastimil (referee) ; Horák, Vladislav (advisor)
The focus of this master thesis design static assessment of shotcrete lining belonging to underground gallery for water supply. This object is a part of larger project called „Uzel Plzeň, 3. stavba – přesmyk domažlické trati“. The gallery with length almost 100 m leads directly under two double-track lines with height traffic importance and two factory sidings. The thesis deals with the recommendation of a suitable technological procedure for excavation and excavation stability. It also includes design of both primary and secondary shotcrete lining. The assessment is based on the evaluation of the outputs of two characteristic cross-sections processed in Plaxis 2D. The outputs consist of information on internal forces, deformations and state of stress in the surrounding rock. Based on this information, a structural design is performed
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The aqueduct under the highway through of the microtunnel
Hoza, Martin ; Kunc, Jaroslav (referee) ; Horák, Vladislav (advisor)
During the construction of water pipeline Strelice is necessary to overcome the D1 motorway. This thesis deals with design of the motorway crossing using trenchless technologies. Combination of pipejacking and shield tunneling is chosen. Static calculation includes determination of the jacking force, proposal of the thrust block and assessment of the reinforced concrete jacking pipes.
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Evaluation of the Management of the Organization ZIKOS
Busta, Karel ; Horák, Václav (referee) ; Lajtkepová, Eva (advisor)
The master`s thesis deals with the evaluation of the management ZIKOS allowance organization. The aim of this work is the cost-benefit analysis and financial analysis to evaluate the management of the organization and propose recommendations for improvement the management of the organization. On the basis of theoretical knowledge referred to in the first part is the second part focuses on the assessment of economics. The third part contains suggestions and recommendations to improve the management of allowance organizations ZIKOS.
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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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