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Back analysis of embankment dam and prediction of its behaviour during accidental design situations
Krajčovič, Ján ; Říha, Jaromír (referee) ; Chalmovský, Juraj (advisor)
Diplomová práce představuje vytvoření softwarového 2D MKP modelu přehrady Slezská Harta v České Republice za pomoci softwaru PLAXIS 2D. V úvodu práce je analýza vodní nádrže, vytvořené jako zásobárna vody a protipovodňové dílo. Analýza sleduje geomorfologii, geologii, konstrukci tělesa hráze, použité materiály a metody, a stávající monitorovací zařízení. Pro pochopení tvorby 2D MKP modelu jsou předloženy a definované metody použitých analýz - metoda konečných prvků, analýza prosakování, materiálové modely, citlivostná analýza. Následně byla definována tvorba struktury modelu - určení posloupnosti použitých analýz, definování vstupních dat a mezních podmínek a tvorba kalibračního segmentu. V závěrečné části práce je analýza dosažených výstupů rozsáhlého testování modelu, jejich korelace s reálnými naměřenými hodnotami a celkové shrnutí přínosu vytvořeného modelu pro jeho využití při předpovídání chování přehrady v extrémních případech.
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Comparative Analysis of Modelling of Reinforced Embankment Face
Fryš, František ; Glisníková, Věra (referee) ; Boštík, Jiří (advisor)
The thesis deals with numerical modeling of reinforced earth wall. The first part of the thesis characterizes and describes these constructions in general and also describes variations of their faces. In the next part the modeling of basic reinforced earth wall construction elements in Plaxis 2D is described. Subsequently the real reinforced earth wall is modeled and some variations of face-modeling are compared.
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Design of Deep Fundation of Elderly Care Home in Plzeň
Janočo, Martin ; Fiala, Radek (referee) ; Brdečková, Helena (advisor)
The objective of this bachelor’s thesis is design of pile foundation of a building in specific geological conditions. The design is based on engineering geology report of the area and a scheme of loads on foundations. Calculations are executed in spreadsheet software Excel and in geotechnical software GEO5 – Pile module. Finally, these calculations are compared with Plaxis 2D output.
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Preliminary study of the construction of a tram tunnel in Brno
Kuhajdik, Adam ; Janků,, Hynek (referee) ; Horák, Vladislav (advisor)
The selection of a suitable tunneling technology within the territory of the town has an essential impact on behaviour of surrounding buildings. The thesis presents basic applicable methods. The selected method is simulated in a mathematical model whose input parameters are defined according to geotechnical investigation and by calculating from cone penetration test. Furthermore, the thesis deals with parametric comparisons of a constructional element in dimensioning, horizontal and vertical shift of this element and simplified comparison of steel and concrete prices. This thesis also contains re – comparison of construction behaviour within a model with real deformations which are measured using an inclinometer in situ.
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Dilatancy of soils as a factor influencing the bearing capacity and load - displacement response of deep foundations
Dvořák, Tomáš ; Koudela, Pavel (referee) ; Chalmovský, Juraj (advisor)
In theory of soil mechanic the dilatancy has a significant influence, which may fundamentally affect bearing capacity and behavior of geotechnical constructions. In the past it was difficult to include influence of dilatancy directly in to calculation, but now with development of numerical analysis and growth of computer performance it is much easier. In this work there are introduced fundamental dilatancy models and phenomen called constraint dilatancy, which causes stress changes in soil or at soil – construction interface. This stress changes may lead to higher bearing capacity. In this work, the effect of constraint dilatancy is focused on bored pile’s shaft. Next target of this work is including dilatancy to calculation. By empirical methods, by direct application with theory of cylindrical cavity expansion and last by numerical calculation with finite element method in software Plaxis with using the Hardening Soil model.
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Numerical analysis of stability of retaining structure in cohesive soils
Fejfarová, Aneta ; Račanský, Václav (referee) ; Chalmovský, Juraj (advisor)
The bachelor thesis deals with numerical modeling of excavation using finite element method in the Plaxis 2D software. Triple-anchored retaining structure is founded in a less permeable cohesive soils. There are described loss of stability, types of the calculation and material model (Hardenig soil model used in the mathematical model) in the theoretical section of this bachelor thesis. Mathematical model of the excavation was described in the practical section of this thesis, specifically first limit state. Part of the thesis is an evaluation of the degree of stability over time, pore pressures and critical shear surfaces.
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Slope stability calculations for small dams
Hajda, Jindřich ; Hodák,, Jiří (referee) ; Říha, Jaromír (advisor)
There are approximately 20 000 small dams in the Czech Republic. This number entails many ponds or small flood attenuation reservoirs, which provide protection against floods. We do not know much about the structure and material properties of these earth dikes. Concerning the small dam stability the current technical standard ČSN 75 2410 focuses foremost on the angle of both the upstream and downstream slopes in case of different materials, and the method of the stability assessment in case of a dam height being 6m or more. Most of these earth dikes are still standing in spite not being built according to any technical standards. They do not follow any standards mostly because they were built before the modern technical standards were published. This diploma thesis focuses on assigning the degree of a reserve in the safety factor for studies of 5 homogeneous earth dikes and 3 inhomogeneous earth dikes. The calculation was done using the Plaxis 2D software using to the shear strength reduction method. The Calculation of the safety degree is made for 4 typical load cases.
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Retaining Walls
Michalčák, Jan ; Fiala, Radek (referee) ; Glisníková, Věra (advisor)
This bachelor thesis deals with retaining walls, methods of the design and defects. The thesis then focuses on gebion retaning walls and their defects. The adopted design of the model of gabion for the calculation through final element method (FEM) is here processed and verified. In the practical part findings are applied to a real situation along a cycle path near the village called Tatranská Polianka. The designed retaining wall from gabion baskets is calculated analytically, using the programme GEO5 and PLAXIS 2D. In conclusion, results are evaluated and compared.
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