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Untitled
Kytková, Alexandra ; Cenek, Filip (referee) ; Ptáček, Jiří (advisor)
My bachelor's thesis is based on a visit to the international conference which will be held at the Taras Shevchenko National University of Kiev in May 23-25, 2013. The purpose of this visit is to record video footage that will be used in the final output.
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A Piece of Work
Maša, Vojtěch ; Stratil, Václav (referee) ; Ptáček, Jiří (advisor)
The topic of this thesis is to induce situation of the thesis defense in a context of the defense of my bachelor thesis. I organize and present as my bachelor thesis the following: Vaclav Stratil took on the role of student and he defends his drawing which is installed during the defense. His written defense writing is available as a part of my thesis. The supervisor of (student) Stratil is Jiří Ptáček, who wrote an opinion of the supervisor for Stratil. I (Vojtěch Maša) am Stratil's opponent and I wrote an oponent's opinion for Stratil.
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Speed Increasing for Track Section Bojkovice-Bohuslavice nad Vláří
Ptáček, Jiří ; Hoza, Miroslav (referee) ; Svoboda, Richard (advisor)
This thesis will examine possibilities of increse speed on a railway track section between Bojkovice - Bohuslavice nad Vláří. The increase of speed will examined according to contemporary geometric parameters of the railway track and with proposed changes of geometric parameters of the railway track. The proposed changes cannot profoundly transformate the body of the railway track. In both cases a restriction of speed by level crossing, a track branching ect. will be taken into consideration or will propose changes of these objects.
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Stress state rock mass monitoring ahead of longwall No. 371 202 at 2ndA block, Mine Plant 2, OKD, a.s
Waclawik, Petr ; Ptáček, Jiří ; Koníček, Petr ; Vavro, Martin ; Staš, Lubomír ; Souček, Kamil ; Kukutsch, Radovan ; Kajzar, Vlastimil
Generally, the accurate knowledge of the stress strain state of the rock mass in the neighbourhood of the mining galleries and underground openings is absolutely critical for their precise support designing, not only in the vicinity of them, but also at a greater distance from them if the phenomenon affecting the rock mass stress fields occurs. Measurement (investigation) of the rock stress is usually carried out by interpretation of the rock mass deformation processes, which can be relatively precisely observed and measured. The roadways are loaded not only by rock pressures in the front of the coalfaces but also by destress blasting realised in the overburden rock seam in the scope of the rockburst prevention. In addition, the rock stress distribution is influenced by old mining activities too, for example by abandoned coal pillars in the seams in overburden, respectively by goaf in the excavated seam. All of these factors can significantly affect the stress-strain behaviour of the rock mass around the mining works.
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