National Repository of Grey Literature 89 records found  beginprevious73 - 82next  jump to record: Search took 0.00 seconds. 
Visualization and quantification of structural-textural parameters of polyurethane geocomposite materials
Ščučka, Jiří ; Souček, Kamil
Study of textures and structures of geocomposite materials with polyurethane binders using optical microscopy, image processing and analysis methods is presented in the paper. The described analytical procedures allow not only documentation and qualitative and quantitative texture-structure analysis of the material, but also an effective use in the process of quality evaluation of carried-out grouting.
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.
Laboratorní zkoušky geokompozitů se zainjektovanou diskontinuitou
Souček, Kamil ; Staš, Lubomír
Příspěvek se zabývá novými poznatky z oblasti cílených úprav vlastností horského masivu pro geotechnické účely na základě zkoumání vlastností geokompozitů na bázi hornin skalního typu a chemických injektážních médií včetně jejich reologického a chemoreologického chování zvláště pak se zaměřením na epoxidové materiály, které nejsou v naší injektážní praxi běžně používány. V příspěvku jsou diskutovány a uváděny zkušební metody a postupy pro výzkum jak čistých injektážních médií, tak geokompozitů se zainjektovanou diskontinuitou, které umožňují optimalizaci výběru injektážního média pro ovlivňování vlastností horninového masivu.
Zkušenosti a poznatky z měření napětí horského masivu v podmínkách OKR
Staš, Lubomír ; Souček, Kamil
Příspěvek pojednává o metodách a hlavních výsledcích měření napěťových stavů in situ realizované na lokalitách české části hornoslezské pánve Ústavem geoniky. Jsou diskutovány metody hydraulického štěpení stěn vrtu a nově zaváděná metoda měření tenzoru napětí, či napěťových změn pomocí kuželové tenzometrické sondy. Jsou popsány první výsledky dlouhodobého měření změn napětí in situ. Jsou popsány a analyzovány výsledky měření napětí metodou hydrofracturing.
New trends in innovation of friction rock-bolts for mining conditions
Paloncy, L. ; Hanzlik, Č. ; Souček, Kamil ; Šňupárek, Richard
Combined friction and grouting bolts (hydraulic expanded) for using in coal seam are described. Results of experimental pull-out tests of two types of friction and grouting bolts of different length in a thick coal seam are presented. The results confirm high values of anchoring of the friction bolts in coal seam.
Results of CMA Project no.34/2003 "Measures toward enhancing the resistance of working face headings and gateways against rock burst induced deformation".
Šňupárek, Richard ; Staš, Lubomír ; Souček, Kamil ; Zeman, Vladislav ; Horyl, P. ; Janas, P.
The work was focused on reinforcing of steel roadway support (reinforcing of particular arches and reinforcing of whole support facility) and measures for strenghtening and change of physical-mechanical properties of rocks and coal in the vicinity of gateroad which increase dynamic resistance of support.
Failure character of coal geo-composites grouting resins base
Souček, Kamil ; Staš, Lubomír ; Obara, Y. ; Fukahori, D.
One of the possibilities of improving stability of longwall gates and roadway driven in coal seams in the application of a chemical grouting that will result in formation of a coal geocomposite in the surroudings of the underground roadway. The properties of such a coal geocomposite differ from the ones of the unmodified coal seam. The presented paper deals with laboratory geo-mechanical tests of pure coal and coal geo-composites prepared in laboratory. The paper discusses the different failure of these original and modified coal samples. The X-ray CT scans were used for observation and demonstration of failure evolution in these samples of pure coal and coal geo-composites.
Horizontal stress in Czech part of Upper Silesian Basin
Staš, Lubomír ; Kolcun, Alexej ; Šimkovičová, Jarmila ; Souček, Kamil
The results of measurement by hydrofracturing method in the area of Czech part of USB are discussed. The measurements proved some general direction of the primary stress impact: high anisotrophy of horizontal stress, relatively high ratio of horizontal to vertical stresses ((SH+Sh)/Sv÷2). Horizontal stresses in the zones intensely disturbed by mining activity indicate magnitudes corresponding only to effect of overburden load in elastic model of rock mass. Orientation of horizontal stress either corresponds direction of presumed effect of superposition of Carpathian nappes or copiers direction of vicinity tectonic faults usually near of them.
Geophysical method study of quality measurement of grouting works in surroudings of mine openings
Staš, B. ; Šňupárek, Richard ; Souček, Kamil
Strengthening grouting represents effective method to influencing of deformation and strength properties of rock mass. The monitoring of efficiency should be integral part of grouting process. This contribution deals with possibilities of utilisation of seismic methods (based on elastic wave propagation in physical-elastic rock environment) in monitoring process of efficiency of strengthening grouting in surroudings of mine openings.

National Repository of Grey Literature : 89 records found   beginprevious73 - 82next  jump to record:
See also: similar author names
8 SOUČEK, Karel
1 Souček, K.
8 Souček, Karel
2 Souček, Kryštof
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