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Analysis of the landslide area on the Odlezelské lake
Sachr, David ; Jerman, Jan (advisor) ; Roháč, Jakub (referee)
This thesis deals with the analysis of landslide areas in the vicinity of Odlezelské Lake, which is located in the western Limnic Permocarboniferous basin of the Žihel Basin. In this area, slope movements are not a frequent natural phenomenon. In the Czech Republic, this is the only slope deformation that has created a 'landslide lake' due to the damming of the Mladotický stream, which flows through this area. The geological conditions play a fundamental role here - the overlying strata consist mainly of arkosic sandstones, sandstones and siltstones. Layers of clay or claystone lie 20-30 metres below the ground surface and the average slope of the layers in the area is 10ř to the north-west, very close to the average slope in the landslides studied. An engineering geological analysis of the landslide areas in the area of Lake Odlezel was carried out. The area was depicted using LiDAR and DMR 5G in QGIS software and thus new morphological maps of the landslide areas were created. Data from the ČÚZK and 48 years old geomorphological maps, which were mapped by Prof. Janský, were used as a basis. Furthermore, a supplementary field survey was carried out, on the basis of which, in combination with LiDAR analysis, the contours of slope deformations of the previous authors were refined. Furthermore,...
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Dubičná landslide - engineering geological mapping and Atterberg limits
Vavřich, Lukáš ; Jerman, Jan (advisor) ; Routner, Martina (referee)
This bachelor's thesis addresses the issue of slope deformations in the České Středohoří region and closely examines the landslide at the Dubičná site. In the late 1960s, significant slope deformations occurred here, endangering a railway embankment and the road beneath it. The landslide is situated in a geologically complex terrain where manifestations of Tertiary volcanism intersect with sediments from the Bohemian Cretaceous Basin. Due to the geological history, the broader vicinity of the studied area features numerous slope deformations with the potential to cause property damage and threaten human lives. Detailed field mapping was conducted in the landslide-prone area, resulting in the creation of an engineering-geological map of stability conditions. This map, utilizing modern remote sensing technologies, intricately depicts the progression, morphology, and shape of the landslide. Soil samples were also collected, and following prescribed laboratory procedures, their index properties were measured, including liquid limit and plastic limit moisture content. Based on the results of these measurements, the presence of a deformation zone within the landslide was estimated to be at a depth of approximately 5.5 meters.
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Assessment of surveying techniques for analyzing the condition of embankment dams: a case study of R3 Hájecká dam.
Pechar, Jiří ; Jerman, Jan (advisor) ; Špaček, Pavel (referee)
The diploma thesis deals with the evaluation of methods for surveying the construction of dams and for identifying faults in their body. In the beginning of the work, the issue of bulk dams is described with an emphasis on the material composition and structural elements in their bodies. The work also describes the types of dam failures, their characteristics, causes and statistics of their frequency of occurrence. Finally, the text of the thesis describes the monitoring of bulk dams. The practical part is dedicated to the evaluation of the applied engineering geological, hydrogeological and geophysical methods and their suitability for determining the condition of bulk dams. Based on the results, the benefits and limitations of individual methods and the possibility of their combined use to achieve more accurate results are described. For the evaluation of the above methods, the R3 Hájecká earth fill dam was selected, on which water began to seep through the left bank side of the dam body in the course of 2020. Of the safety ones, the water level in the reservoirs was lowered before the field work, which reflects the choice of survey methods carried out.
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Klikov Formation in a newly localized landslide area near České Budějovice
Pilařová, Eliška ; Jerman, Jan (advisor) ; Mužík, Vlastimil (referee)
Diploma thesis is focused on obtaining new knowledge about the Klikov Formation of the České Budějovice Tertiary Basin during the extraordinary opportunity of construction a section of the D3 highway at the southern edge of České Budějovice near the villages of Roudné and Včelná. The location is also interesting because of newly detected landslide. The route of the highway is designed in large side-hill cut. The cut reached a total height of up to 20 m and was mainly carried out in the soft rock of the Klikov Formation, while vertical rock slopes up to several meters high remained without any stabilization during excavation. This made it possible to examine the soft rock of Klikov Formation in various aspects, e.g. stability, structural properties, properties of the rock material itself, etc. The text is divided into two parts. The first part describes construction works during the excavation of side cut, and the second to laboratory tests. The diploma thesis presents the connection between field observation and laboratory results.
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Development and validation of a hypoplastic model for soft clays incorporating rate effects and strength anisotropy
Jerman, Jan ; Mašín, David (advisor) ; Blahůt, Jan (referee) ; Hrubešová, Eva (referee)
The thesis presents modelling framework for soft clays. Soft clays typically occur in marine environment, coastal areas and along rivers, soft clay deposits are also associated with the periglacial conditions. Soft clay seabeds are also prevalent in locations used as foundations of various energy sources (renewable and hydrocarbon). Growing world population increased demand for land, and this, consequently, leads to seaward land reclamation for urban development in coastal areas. Thus, construction on soft soil deposits has become increasingly important as soft clays occur in locations of construction projects for city infrastructure. The stress-strain behaviour of soils, especially clayey soils, is well-known to be rate- dependent. This fact is relevant for specific engineering projects, where the long-term performance of constructions is of interest. This is particularly important for soft clays as the very high degree of compressibility in primary compression and during creep makes rate-dependent soil behaviour an important factor for geotechnical problems. Moreover, the slow slope movements of slow-moving landslides and creeping slopes are controlled mostly by shear creep properties of the shear-zone soil and the effective stress state. Thus, for the case of creeping landslide modelling, a...
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Modelling of soil asymptotic behaviour using discrete element method
Jerman, Jan ; Mašín, David (advisor) ; Boháč, Jan (referee)
Aim of this study is to characterize asymptotic states of particulate materials, including states in extension. Asymptotic states are defined as states reached after a sufficiently long stretching with a constant direction of the strain rate. They are attractors in the behaviour of granular material and they are reached independetly of the initial state. Discerete element method is used in the simulations, where the influence of strain rate direction on the final state is studied. Results for strain rate direction higher than 0 obtained by Mašín (2012a) are then compared with results for strain rate direction lower than 0. These sets of results coincide qualitatevely.
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Modelling of soil asymptotic behaviour using discrete element method
Jerman, Jan ; Mašín, David (advisor) ; Boháč, Jan (referee)
Aim of this study is to characterize asymptotic states of particulate materials, including states in extension. Asymptotic states are defined as states reached after a sufficiently long stretching with a constant direction of the strain rate. They are attractors in the behaviour of granular material and they are reached independetly of the initial state. Discerete element method is used in the simulations, where the influence of strain rate direction on the final state is studied. Results for strain rate direction higher than 0 obtained by Mašín (2012a) are then compared with results for strain rate direction lower than 0. These sets of results coincide qualitatevely.
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