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Forearc deformation and strain partitioning during growth of a continental magmatic arc: the northwestern margin of the Central Bohemian Plutonic Complex, Bohemian Massif
Dragoun, František ; Žák, Jiří (advisor) ; Ulrich, Stanislav (referee)
This doctoral thesis is focused on analysis of tectonic deformations associated with the Late Devonian subduction followed by the Early Carboniferous continental collision of the Saxothuringian and overriding upper-crustal Teplá-Barrandian units, which led to the growth of a large magmatic arc (the ~354-337 Ma Central Bohemian Plutonic Complex) in the central part of the Bohemian Massif. Far-field tectonic forces resulting from the collision produced ~WNW-ESE to ~NW-SE regional shortening across the forearc upper crust above the subduction zone; the shortening was accommodated by predominantly top-to-the-ESE tectonic transport along the southeastern flank of the Teplá-Barrandian unit. Approaching the magmatic arc margin, the regional structural pattern changes and exhibits significant acrossand along-strike variations interpreted as a result of strain partitioning, where the Saxothuringian/Teplá-Barrandian convergence interacted in different ways with the intruding magma pulses. Around the voluminous, northeasterly ~354 Ma Sázava pluton the principal shortening was at high angle to the forearc-facing intrusive contact and the host rocks were significantly thermally softened. The regional top-to-the-ESE tectonic transport converted here into arc-parallel ductile flow within the structural aureole...
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Implementation of the SCL method for tunnel construction
Slezáková, Pavlína ; Dragoun, František (advisor) ; Uhrin, Michal (referee)
This Bachelor's thesis is a summary of recent knowledge about the tunneling method Sprayed Concrete Lining. The first part of the thesis is focused on the origins of sprayed concrete, on the history of the SCL method and its connection to the NRTM method. Essential parts of this thesis include the principles of excavation using the SCL method, the excavation process and the requirements, such as construction monitoring. Additionally, there is an overview of shotcrete material; both, what the mixture is composed of and what geotechnical parameters, usually, limit the application of this method. The second part of the thesis presents mechanical parameters of clay rocks, and also includes a summary of the possibilities of using the SCL method in the Czech Republic, with a specific example of a planned project.
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Forearc deformation and strain partitioning during growth of a continental magmatic arc: the northwestern margin of the Central Bohemian Plutonic Complex, Bohemian Massif
Dragoun, František ; Žák, Jiří (advisor) ; Ulrich, Stanislav (referee)
This doctoral thesis is focused on analysis of tectonic deformations associated with the Late Devonian subduction followed by the Early Carboniferous continental collision of the Saxothuringian and overriding upper-crustal Teplá-Barrandian units, which led to the growth of a large magmatic arc (the ~354-337 Ma Central Bohemian Plutonic Complex) in the central part of the Bohemian Massif. Far-field tectonic forces resulting from the collision produced ~WNW-ESE to ~NW-SE regional shortening across the forearc upper crust above the subduction zone; the shortening was accommodated by predominantly top-to-the-ESE tectonic transport along the southeastern flank of the Teplá-Barrandian unit. Approaching the magmatic arc margin, the regional structural pattern changes and exhibits significant acrossand along-strike variations interpreted as a result of strain partitioning, where the Saxothuringian/Teplá-Barrandian convergence interacted in different ways with the intruding magma pulses. Around the voluminous, northeasterly ~354 Ma Sázava pluton the principal shortening was at high angle to the forearc-facing intrusive contact and the host rocks were significantly thermally softened. The regional top-to-the-ESE tectonic transport converted here into arc-parallel ductile flow within the structural aureole...
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