National Repository of Grey Literature 99 records found  beginprevious76 - 85nextend  jump to record: Search took 0.00 seconds. 
Rock Evaluation for the purposes of the task Okrouhlá Radouň - digital maps of interest area and 3D model of deposit and gas storage
Souček, Kamil ; Staš, Lubomír ; Martinec, Petr
Zpráva se zabývá hodnocením hornin pro posouzení možnosti umístění podzemního zásobníku plynu v zájmové oblasti „Okrouhlá Radouň“. Jedná se převážně o laboratorní práce, které stanovují základní vlastnosti žuly. V rámci posuzování vlastností žuly byly stanoveny její fyzikálně mechanické vlastností hornin ve třech charakteristických směrech anizotropie (zkušební tělesa byla připravena ve třech na sobě kolmých směrech a to ve směrech přibližně kolmých na tři základní dominantní puklinové systémy Q, S a L), dále bylo provedeno podrobné petrografické a mineralogické vyhodnocení odebraného granitu. Z fyzikálně mechanických vlastností byly hodnoceny objemová hmotnost, pórovitost, nasákavost, tepelná vodivost, měrná objemová tepelná kapacita, pevnost v prostém tlaku, pevnost v příčném tahu a v tahu za rovinného ohybu, moduly přetvárnosti, Poissonovo číslo a abrazivita. Dále byly stanoveny meze porušení zájmových hornin podle Hoek – Brownova kritéria a bylo provedeno srovnání hodnot naměřených modulů přetvárnosti a elasticity stanovených zkouškou v jednoosém tlaku při cyklickém zatěžování.
Rock Evaluation for the purposes of the task Skalka – digital geological maps
Souček, Kamil ; Staš, Lubomír ; Martinec, Petr
Zpráva se zabývá hodnocením hornin pro posouzení možnosti umístění úložiště radioaktivního odpadu v zájmové oblasti „Skalka“. Jedná se převážně o laboratorní práce, které stanovují základní vlastnosti hornin odebraných ze dvou lokalit. V rámci posuzování vlastností hornin byly stanoveny fyzikálně mechanické vlastností hornin ve dvou charakteristických směrech jejich anizotropie (ve směru podélném k foliaci hornin a ve směru kolmém k foliaci), dále bylo provedeno podrobné petrografické a mineralogické vyhodnocení odebraných hornin. Z fyzikálně mechanických vlastností byly hodnoceny objemová hmotnost, pórovitost, nasákavost, tepelná vodivost, měrná objemová tepelná kapacita, pevnost v prostém tlaku, moduly přetvárnosti, Poissonovo číslo a abrazivita. Dále byly stanoveny meze porušení zájmových hornin í podle Hoek – Brownova kritéria a bylo provedeno srovnání hodnot naměřených modulů přetvárnosti a elasticity stanovených zkouškou v jednoosém tlaku při cyklickém zatěžování.
Verification of Recent-Stress-Strain in Czech part of Upper Silesian Coal basin
Ptáček, Jiří ; Grygar, R. ; Koníček, Petr ; Souček, Kamil ; Staš, Lubomír ; Waclawik, P.
A stresss strain model of Variscan structural tectonic pattern in the Czech part of Upper Silesian Coal Basin (USCB) based on paleostress analyse have been interpreted. It was compiled used many of tectonic measurements of planar and linear elements and their comparison with the knowledge of dynamic development of Variscan body in a larger framework of Moravo Silesian zone. It was took account the influence of Alpine deformation due to Carpathian nappe. There were more stress tensor gauging realised in the region above all using hydrofrac and treated overcoring methods during last ten years. It’s becoming apparent that for information of recent stress fields is usable the interpretation of focus mechanisms of energetic significant seismic events, which were observed here more than ten years. The aim of project is the verification of recent stress strain state in the easternmost region of Czech part of USCB.
Permeability measurement of geocomposites on orthogonal specimens
Souček, Kamil ; Staš, Lubomír
The hydraulic conductivity coefficient of geocomposites is important parameter for evaluation of sealing chemical grouting. There can be problem with preparing of cylindrical gocomposite specimens by drilling for permeability measurements in some cases (e.g. specimens fall into small pieces of irregular shapes). In such cases shaping of geocomposite specimens is easier by cutting than drilling. The paper deals with concept of preparing and methods of hydraulic conductivity measurements at orthogonal geocsomposites specimens conditions. There are some results of geocomposites permeability measurements in this paper.
Measurement of Tensor Stress Changes by Conical Gauge Probe in Ostrava-Karvina Coal Basin
Staš, Lubomír ; Souček, Kamil ; Knejzlík, Jaromír ; Waclawik, P. ; Palla, L.
A device designed on base of measurement local deformations on compact conical ended borehole was used for long term monitoring of stress changes induced by closed underground human activity.The changes of stress state of rock mass impacted by progress of long-wall were investigated. This experiment demonstrated that monitored strain changes on borehole bottom are formed both by geomechanical situation based on a progress of long-wall and perhaps by local geomechanical situation based on stress redistribution after boring of measuring borehole and on plastic deformation of creeping rock material.
Prospects of the use of X-ray computer tomography in geomaterials and geotechnics research
Souček, Kamil ; Staš, Lubomír
The paper deals with possibilities of industry X-Ray CT utilization in geo-materials and geotechnical research. This paper was elaborated on the basis of professional literature study (Proc. of the Int. Workshop on X-ray CT for Geomaterials – soils, concrete, rocks, Geox 2003 and Proc. of the Int. Workshop on Advances in X-Ray Tomography for Geomaterials, Geox 2006) and first experiences of X-Ray CT utilization within the frame of research activities of Institute of geonics, ASCR, at Kumamoto University. There are some results from coal geocomposite failure study, visualization of geocomposite wetting (soaking) process and checking of drill core integrity after carried out overcoring stress measurements in the paper.
Observation of phases of surface changes above exploited deposits of sedimentary type
Kajzar, Vlastimil ; Doležalová, Hana ; Staš, Lubomír ; Souček, Kamil ; Šimkovičová, Jarmila
Due to exploitation of coal and other raw materials of sedimentary type there happen many surface changes connected mostly with subsidence, shifts and deformations of the area of interest. Such processes happen mainly in the overlaying strata of exploited coalface. Size and directions of these movements and deformations depend generally on many factors, primarily on geo-mechanical properties of overlaying strata and general technique of exploitation of the deposit. One of the ways of surface observation of time spatial changes is the usage of modern methods for precise determination of changing position of geo-features. Among these methods we rank GPS surveying and usage of methods for gaining data from aerial photogrammetry. Subsequent processing, analysis and modelling of output data by means of modern GIS software offer an efficient source of information for subsequent work and decisions.
Using of a conical gauge probe to long term monitoring of the stress changes
Staš, Lubomír ; Souček, Kamil ; Knejzlík, Jaromír ; Palla, L.
In frame of development of new device to full stress tensor measurement a simplified variant of gauge probe was completed. This variant, which is connected to datalogger by cable, is very good for long term monitoring of the stress changes. Functionality of that was verified not only on laboratory also in-situ in carboniferous rock mass during detection of the stress changes in relation to long wall progress.
Reinforcing of incoherent coal pillar at longwall face no 39 204 in coal mine Lazy - knowledge, experience
Souček, Kamil ; Staš, Lubomír ; Ščučka, Jiří ; Krčmář, V.
The paper deals with first knowledge and experiences about incoherent coal pillar reinforcing in the forefield longwall face no 39 204 in colliery Lazy. The reinforcing was designed and realized by means of long grouting boreholes (up to 20 m long) and polyurethane grout CarboPur WX. Designed grouting technology usually doesn´t use for stabilization of coal seam in the local colliery conditions.

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