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Securing of Deep Cut in Slide Area
Pargač, Martin ; Boštík, Jiří (referee) ; Glisníková, Věra (advisor)
The thesis called Securing of Deep Cut in Slide Area focuses on the basic analysis of the problems connected to landslides and securing of the slopes. It also presents a solution of a certain problem, where the slope stability, potencional landslide launchers and subsequent remediaton are discussed.
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Programming of the ELSM method for the advanced stability analysis of geotechnical structures
Štetiar, Juraj ; Koudela, Pavel (referee) ; Chalmovský, Juraj (advisor)
This master's thesis addresses the issue of slope stability, which is a key task in the design of geotechnical structures. The study focuses on the Enhanced Limit Strength Method (ELSM), which leverages the advantages of the Finite Element Method (FEM) while allowing the control of the position and shape of the slip surface. ELSM is particularly advantageous for addressing the stability of embankments and aerial slopes of earth-filled water reservoirs. The objective of the thesis is to develop an algorithm for the ELSM method as an additional module for existing FEM solvers. The theoretical part of the thesis explains the principles of commonly used slope stability calculation methods, such as the Limit Equilibrium Method (LEM) and the Strength Reduction Method (SRM). Subsequently, the principles of the ELSM method (determining the factor of safety for the critical slip surface) are introduced, and the optimization algorithm Particle Swarm Optimization (PSO) is briefly described. In the practical section of the thesis, the programmed algorithm for slope stability calculation using the ELSM method with the utilization of the Particle Swarm Optimization (PSO) optimization module is explained. The correctness of the algorithm is verified, and a comparison with the SRM and LEM methods is conducted through three verification studies, including a simple homogeneous slope, a heterogeneous slope with a horizontal material interface, and a real case study assessing the external stability of the dam structure at the Vlachovice waterworks.
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Engineering geological survey evaluation of area affected by lanslides in Budkovice
Prechtlová, Kateřina ; Paseka, Antonín (referee) ; Erbenová, Alexandra (advisor)
This Thesis deals with evaluation of engineer-geological survey of area affected by landslides near Budkovice. The area of interest is situated in the south part of Boskovická brázda on the left bank of the river Rokytná. The Thesis first outlines the problems of slope movements in general: why it’s appropriate to study them, what factors play role in their creation, what areas are prone to their creation, how to proceed with engineer-geological survey and how the slope stability is solved. Next itfocuses on the above mentioned landslide in village Budkovice. Geology and hydrogeology of the area of interest were studied. Carried out survey works were summarized. I became familiar with their results and outputs.Friction angle of the residual strength on the slip plane was calculated using Pettersson’s method, it’s value was 11,27°. Simple geological cuts though the slope area and calculation cut were made. Groundwater level was measured on the preserved drill holes and it was compared with former values.
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Influence of temperature on the rock stress distribution and slope stability
Racek, Jonáš ; Blahůt, Jan (advisor) ; Kycl, Petr (referee)
This thesis deals with the influence of cyclic temperature changes on the surface of a rock mass on temperature and stress fields inside the rock slope and their influence on local and overall slope stability. The review part deals with the evolution and stability of rock slopes with a focus on temperature oscillations. Furthermore, thermal parameters of rock masses, rocks and minerals are discussed. In the practical part a 2D numerical linear-elastic model of the response of the rock slope Pastýřská stěna in Děčín to cyclic temperature changes during different periods was developed. It was used to determine the depth of penetration of temperature cycles and the associated changes and redistribution of stresses within the mass and the zones susceptible to mechanical failure of the rock. iii
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Numerical modelling of resealing effects in earthen dams
Bredy, Somia ; Hodák,, Jiří (referee) ; Miča, Lumír (referee) ; Jandora, Jan (advisor)
This study focuses on the most important sealing technologies; Diaphragm walls and Jet grouting as a major most popular reliable option when it comes to engineering constructions rehabilitation. Those two methods have been used in Karolinka dam for reducing seepage through its body. Diaphragm walls were used along the dam, and jet grouting was used at both ends of the dam. The study deals with the possibility of numerical modelling of these two technologies. It is included how to carry out, interaction with adjacent soil, cement shrinkage, slope stability, changing of pore water pressure with the time, dynamic analysis of drilling rod and the effects of both technologies on slope stability, seepage and settlement of dam. This modelling was conducted with the finite element method based on software Plaxis 3D.
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Slope stability of Jizera river valley slopes in Semily region
Kujan, Ondřej ; Novotný, Jan (advisor) ; Vybíral, Roman (referee)
The thesis deals with slope stability of a landslide "U Čtrnácti pomocníků", which is located in the north-eastern part of the city Semily in the Liberec district. The thesis is divided into theoretical and practical part. The theoretical part was carried out literature search on the issue and the natural conditions around the wider area of interest. The practical part consists of individual sections within which the research were conducted archival documentation, mapping areas of interest, own technical work, sampling and geophysical measurements and laboratory work and stability calculations. Also the engineering geological model of the landslide was created. The results of the practical part are used as the basis for the final engineering geological evaluation of this area.
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Zhodnocení vlivu dřevin na stabilitu svahu v Žižkových sadech v Hradci Králové
Bradáčová, Alžběta
Among the most positive functions of trees in the cities are microclimate improvement and stabilization of slopes against erosion and landslides. The amount and distribution of water in the soil affect surface erosion and the stability of the slope. The aim of the study is to assess the influence of trees on the slope stability in a city park ‘Žižkovy sady’ in Hradec Králové. The study comprised of fieldwork, data processing, and hydrological modeling. During the fieldwork, the soils physical properties at the locality were studied under various types of vegetation cover. The soil moisture was measured under the trees and under the grassland from November 2015 to May 2017. Hydrological modeling in software PERSiST supported the soil moisture measurements, suggesting that trees have higher water uptake than other land use categories: grassland and paved area present in the locality. Modeled evapotranspiration was 30 % higher for trees than for grassland and 63 % higher for trees than for paved area, while total runoff for trees during the season was only 70 mm compared to 182 mm at the grassland and 447 mm at the paved area. The trees had a positive effect on the decrease of surface runoff through transpiration and interception, which mitigates of potential erosion and drains. Furthermore higher root diameter and rooting depth of trees than grass significantly improve slope ability. Potential tree removal on slopes of the locality may lead to increased erosion and landslides of existing slopes due to the excessive moisture in the low cohesive soils, the loss of anchoring roots and the increase of water infiltration into the soil.
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Landslides in shallow Neogene basins along the southwestern margin of the Carpathian Foredeep in Moravia
Brdečková, Helena ; Glisníková, Věra (referee) ; Hrubešová,, Eva (referee) ; Boštík, Jiří (advisor)
The Carpathian foredeep is a lengthwise depressed area in the Carpathian foreland. In Moravia, it is mainly filled with Neogene soils. The thesis focuses on the South Moravian landslides which occurred in shallow relicts of Neogene deposits along a foredeep margin which lie on the rocks of the Bohemian Massif. Landslide activity within these shallow basins is a result of a number of factors. In the theoretical part, important general features of landslide areas, their geological conditions and hydrogeological regime are investigated. Next, available data on the geomechanical behaviour of soils, often connected with these landslides, are summarized and evaluated. The case studies deal with the landslide localities Budkovice-Svízla, Brno-Bystrc and Znojmo. The case study of Budkovice-Svízla is based on an extensive engineering geological survey of the locality and the measurement of groundwater levels in the years 1988 – 2017. In the thesis, the hydrogeological regime of the area is analysed and a reconstruction of the ground surface before slope movement is carried out. The probable trigger mechanisms, the development of sliding and the efficiency of the executed remedies of the landslide are evaluated by numerical studies. In conclusion, general recommendations for an engineering-geological survey and building activities in the area of interest are formulated.
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