|
|
Determination of erosion thickness of Brno Tegl
Malát, Richard ; Boháč, Jan (advisor) ; Hrubešová, Eva (referee) ; Miča, Lumír (referee)
The thesis deals with an application of the geotechnical numerical back analysis and several other geotechnical conventional techniques in estimating the thickness of eroded sediments. Investigated strata is the Lower Miocene marine clay, often called "Tegl" which was deposited in the Carpathian Foredeep in the eastern part of the Czech rep. Numerical back analysis is based on an assumption that erosion thickness of a soil can be derived from its stress sate represented by K0 coefficient (coefficient of earth pressure at rest). The erosion thickness given by the numerical back analysis is compared with two estimations using Baldwin-Butler's equation and Casagrande's concept of preconsolidation stress. The erosion thickness is also derived from K0 values given by two field probes: Flat dilatometer (DMT) and Push-in spade shaped pressure cell (PSPC). The numerical back analysis was applied to galleries and adits opened during site investigation of the Královo Pole Tunnels in Brno. Both the samples for laboratory analyses were taken and the field tests were carried out in area of Brno city. Discrepancy of the results is analyzed and the conclusion is that the results given by the four conventional mentioned techniques (Baldwin-Butler, Casagrande, DMT, PSPC) are strongly distorted if the investigated...
|
|
|
Some railway tunnels of old era in territory of Czech Republic
Černý, Tomáš ; Rott, Josef (advisor) ; Malát, Richard (referee)
The Bachelor thesis deals with some tunnels from the total number of 120 railway tunnels build in the period 1848-1910 in the territory of the Czech Republic. The aim of these admirable buildings was the research for masonry, geology and rock strength. The introductory articles are devoted to the classical tunneling methods used in earlier times. As a result of today's higher operating speeds of trains, which was not taken into account when initially planning the lining and limitation to the use of stone and wood only. The work includes the most frequent reconstruction methods for tunnel optimization, the possibility of faster transport and their stability. It has been shown that, for the purpose of possible reconstruction, it is necessary to count on the considerable strength of the masonry which, even after 100-170 years, often does not show signs of deep degradation.
|
|
|
Some railway tunnels of old era in territory of Czech Republic
Černý, Tomáš ; Rott, Josef (advisor) ; Malát, Richard (referee)
The Bachelor thesis deals with some tunnels from the total number of 120 railway tunnels build in the period 1848-1910 in the territory of the Czech Republic. The aim of these admirable buildings was the research for masonry, geology and rock strength. The introductory articles are devoted to the classical tunneling methods used in earlier times. As a result of today's higher operating speeds of trains, which was not taken into account when initially planning the lining and limitation to the use of stone and wood only. The work includes the most frequent reconstruction methods for tunnel optimization, the possibility of faster transport and their stability. It has been shown that, for the purpose of possible reconstruction, it is necessary to count on the considerable strength of the masonry which, even after 100-170 years, often does not show signs of deep degradation.
|
|
|
Railroad tunnel Praha-Beroun - as an example of underground structure in challenging karstic aresa
Belokopytov, Daniil ; Rott, Josef (advisor) ; Malát, Richard (referee)
This paper discusses impressive project of the tunnel between Prague and Beroun. The length of the structure, spreading up to 25 km, leads to need of overcoming many risks, which may the tunnel encounter. The text is focused on specific issues typical for areas built by karstic rocks, which generally present one of the most dangerous environment for building architectural projects of any kind. It concentrates on description of Bohemian karst and karstic features, which are likely to appear in studied area. It strives for delimintion of risks and suggestion of proper investigtion and remedition methods, suituable for given project. A part of the paper is a brief introduction into main tunneling technology, applicable for tunneling construction and discussion of possibilities of particular tunneling method.
|
|
|
Groundwater aggression and the impact of geological environment
Štěpán, Jiří ; Král, Jan (advisor) ; Malát, Richard (referee)
This bachelor thesis deals with groundwater aggressiveness on two sheets of detailed engineering geology maps of Prague 1:5000. The aim of this thesis is an effort to verify how much geological environment of inner Prague participates in chemical composition of groundwater. The chemical analysis were evaluated using limit values stated in valid norm ČSN EN 206 Concrete - Specification, performance, production and conformity. The chemical analysis that analyzed aggressive components (SO4 2- , CO2 a pH) and total dissolved solids discovered that the geological environment affect the chemical composition of groundwater very strongly. Groundwater in Ordovician shale commonly contains high amount of dissolved solids with a lot of sulphate. In geological environment containing quartzite, greywacke, quartz and greywacke sandstone the groundwater has small amount of dissolved solids and no aggressive component is dominant as well as too high compared to the shale.
|
|
|
Evaluation of Geotechnical Conditions in Vodochody Airport Area
Sotorník, Viktor ; Král, Jan (advisor) ; Malát, Richard (referee)
This work looks into geotechnical conditions in Vodochody Airport area. In this work research into available literature, sampling and laboratory processing of the samples were conducted. Based on the results of laboratory examinations, evaluation of suitability of the tested materials from the viewpoint of corresponding standards was accomplished. Two geological cross sections were also constructed. Basic classification analysis and additional tests after ČSN 73 6133, Chapter 4 were conducted. Results show that after compaction the quaternary fluvial deposits which cover the examined area can be used in subbase of the airport road system. Other constructions, which do not require deep foundation methods, can too be founded on this soil with no complications. Lastly the work points out several problems which may occur in the area and presents findings that will need to pay attention to in case of further exploration.
|
|
|
Suction in undisturbed samples of Brno Clay determined by filter paper method
Mohyla, Tomáš ; Boháč, Jan (advisor) ; Malát, Richard (referee)
Negative pore pressure (suction) in soils can be measured by various methods. Probably the most precise way is using the 'Imperial College suction probe', which is briefly described, was however not available. A simple alternative is represented by the filter paper method. It was used to determine the suction in the undisturbed samples of the overconsolidated Miocene clay from the town of Brno (Brno Tegel). However the capillary suctions determined by the filter paper were unrealistically high, and could not be used in estimating the in-situ horizontal stresses (at rest coefficient K0) in the Tegel. The reasons for the failure are discussed and possible future steps are suggested.
|
guest ::
