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Convergence measurement of CSM Sever vent shaft and adjacent surroundings on 3rd floor using 3D terrestrial laser scaner technology
Kajzar, Vlastimil ; Koníček, Petr
On the basis of a contract, the Institute of Geonics of the CAS realized repeated convergence measurement of selected part of the mining roads and appropriate part of vent shaft on the 3rd floor in the vicinity of the CSM Sever vent shaft. The main reason was to capture spatio-temporal and dynamic changes in relation to the mining of the coalface No. 292 200/4. A section of the embankment of the 3rd floor of the vent shaft was selected for the convergence measurement.\nThe subject of the use of terrestrial laser scanning technology was to capture the current spatial situation of the vent pit on the 3rd floor of the CSM Sever mine and its adjacent surroundings. The wider area around the shaft and the part of the vent shaft directly visible from the level of the galleries of the 3rd floor were scanned. The scanning was performed using a Leica ScanStation C10 laser scanner. The rescanning was performed using a FARO Focus S350 laser scanner.
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Convergence measurement of the vent shaft on the 3rd floor during the mining of coalface No. 292 200/4
Koníček, Petr ; Kajzar, Vlastimil ; Kukutsch, Radovan ; Staš, Lubomír
On the basis of a contract, the Institute of Geonics of the CAS realized repeated convergence measurement of selected part of the mining roads and appropriate part of vent shaft on the 3rd floor in the vicinity of the ČSM Sever vent shaft. The main reason was to capture spatio-temporal and dynamic changes in relation to the mining of the coalface No. 200 200/4. A section of the embankment of the 3rd floor of the vent shaft was selected for the convergence measurement. The work can be divided into 3 separate tasks - terrestrial laser scanning of the vent shaft from level of the 3rd floor, pilot laser scanning of the vent shaft from the skip elevator and evaluation of seismological activity registered during the mining of the coalface No. 292 200/4.
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Comprehensive geological characterization of URF Bukov – part II Geotechnical characterization.
Souček, Kamil ; Vavro, Martin ; Staš, Lubomír ; Kaláb, Zdeněk ; Koníček, Petr ; Georgiovská, Lucie ; Kaláb, Tomáš ; Konečný, Pavel ; Kolcun, Alexej ; Králová, Lucie ; Kubina, Lukáš ; Lednická, Markéta ; Malík, Josef ; Martinec, Petr ; Ptáček, Jiří ; Vavro, Leona ; Waclawik, Petr ; Zajícová, Vendula
This final report was processed as a part of Radioactive Waste Repository Authority project Research support for safety evaluation of the deep repository, which is a part of the preparation for the deep repository of nuclear waste (further DR). The aims of the project were collection and interpretation of geological data, the creation of models and obtaining information necessary for evaluation of potential sites for DR emplacement regarding long-term safety. On the basis of public submitting act, a 4-year contract was signed with ÚJV Řež, a.s. and its subcontractors: Czech Geological Survey, Czech Technical University in Prague, Technical University in Liberec, Institute of Geonics of Czech Academy of Sciences, and companies Arcadis CZ, Progeo, Chemcomex Praha and Centre for Research Řež about providing research support for evaluation of long-term safety.
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Authentication of real rock mass field voltage to increase safety in anomalous stress states
Koníček, Petr ; Staš, Lubomír ; Ptáček, Jiří ; Kaláb, Tomáš ; Chura, Jan ; Souček, Kamil ; Waclawik, Petr
Voltage fields are one of the key factors that, decisively, along with the mechanical and remodeling properties of rocks, greatly influence the behavior of the mountain massif. Knowledge of stress fields is beneficial for the design and successful implementation of geotechnical underground projects (eg for the assessment of the stability of underground spaces, the behavior of proposed reinforcements of underground structures, for space-time placement of underground structures) especially in non-trivial geomechanical conditions, both in terms of natural factors affecting stress fields structural and geological structure of the rock mass, tectonic stress, cracks and discontinuity in the rock mass) as well as anthropogenic factors (geomechanical configuration of the underground spaces and dynamics of their changes). Geotechnical practice in our (Czech) conditions is usually used only calculations of a voltage field based primarily on the theoretical behavior of the rocks and the assumed vertical geostatic pressure at a given depth. The development of possible progressive deformations of the stress field is then derived from the development of anthropogenic interventions into a relatively homogeneous massif. In fact, tension is also affected by close geological structures. The data obtained from the study of the magnitude, direction and change of stress in the mountain massif are a significant contribution in mathematical modeling where they can be used as input parameters to obtain a more accurate picture of the behavior of mountain massifs and underground structures in the subject areas.
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Final research report to the project PB-2014-ZL-U2301-004-BUKOV
Souček, Kamil ; Vavro, Martin ; Staš, Lubomír ; Kaláb, Zdeněk ; Koníček, Petr ; Georgiovská, Lucie ; Kaláb, Tomáš ; Konečný, Pavel ; Kolcun, Alexej ; Králová, Lucie ; Kubina, Lukáš ; Lednická, Markéta ; Malík, Josef ; Martinec, Petr ; Ptáček, Jiří ; Vavro, Leona ; Waclawik, Petr ; Zajícová, Vendula
Bukov Underground Research Facility (Bukov URF) has been built as a test site to assess the properties and behaviour of the rock mass analogous to selected candidate sites. It is situated at a depth corresponding to the proposed storage depth of the final locality for the Czech Republic´s deep repository of high-level radioactive waste. Bukov URF is located in the Vysočina Region, the cadastral district of Bukov, approx. 3 km south-eastwards from the municipality of Dolní Rožínka. The underground research facility is placed approx. 300 m from the Bukov-1 shaft, namely on the level 12 of the shaft, at the depth of about 550 – 600 meters below the Earth’s surface. As for the regional geology, Bukov URF is found at the southern part of the Rožná uranium deposit, at the north-eastern edge of the Strážek Moldanubicum close to its contact with the Svratka Unit. The rock mass is composed of a relatively monotonous sequence of differently migmatized biotite gneisses to stromatic migmatites, continuing with amphibole-biotite to biotite-amphibole gneisses and amphiboles, with occasional fine intercalations of aplites, pegmatites or calc-silicate rocks (erlanes). Between 2013 and 2017 and within the complex geotechnical characterization of the Bukov URF, the Institute of Geonics of the Czech Academy of Sciences (Ústav geoniky AV ČR, v.v.i.) in Ostrava carried out a series of laboratory and field works in order to provide a detailed description of the geotechnical and geomechanical properties and quality of the rock mass. The works included the determination and assessment of the physical-mechanical properties of the rocks sampled from the walls, boreholes and ground surface in the locality, the determination of stress state and deformation properties of the rock mass using the methods of hydrofracturing of borehole walls, Goodman Jack and CCBO, or CCBM, determination of the rock mass quality based on selected index geomechanical properties, periodic, long-term strain-gauge measurements and convergence measurements, and the assessment of the effect of technical and mine-induced seismicity on the rock mass of interest. The implemented set of research works was supposed to render a sufficient and integral whole of geotechnical and geomechanical knowledge vital for the subsequent implementation of extensive research experiments focused on long-term safety and technical feasibility of the future national deep repository of radioactive waste.
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Parametric study of usability of selected surveying equipment for monitoring of mine workings stability in undermined areas
Kajzar, Vlastimil ; Kukutsch, Radovan ; Koníček, Petr ; Waclawik, Petr ; Šňupárek, Richard
Although the deformation measurements are in mining practice routine activities, the development of information and surveying technology shows, that it is possible to approach this problematics in a new way. One of the options is the application of terrestrial 3D laser scanning technology, which can be successfully used both for purposes of monitoring - deformations of objects on undermined area and mine workings at all.\nSubmited parametric study presents the use of laser technology in the research activities of the Institute of Geonics, v.v.i., within the ICT-PU project. This study deals with technical and theoretical aspects of laser scanning, which verification in situ has been a precondition for the subsequent successful application of this technology both on the surface and in the mining environment. The main scope of the study is dedicated to the deployment of selected technology in solving specific tasks. In the undermined areas were achieved knowledge used in solving the problems of monitoring the stability of slopes and rock faces of mining chasm. In the underground mine workings, this technology has been successfully deployed for the purposes of the spatial deformation monitoring of selected longwall corridor at mine Karvina and also for the long-term monitoring of coal pillars in Room and Pillar pilot project at ČSM coal mine.\nAt the end of a parametric study is special space devoted to the limiting factors of 3D laser scanning and also to the summary of best practices of scanning in such highly exposed conditions.\n
Fulltext: content.csg -  PDF
Plný tet: UGN_0472640 - PDF
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Partial Report IV / 2016 - Rating of the deformation stress monitoring the state of the rock mass during mining coal seam 30 (634) within the trial operation of mining method corridor - a pillar in OPJ ČSM - NORTH
Waclawik, Petr ; Ptáček, Jiří ; Kukutsch, Radovan ; Kajzar, Vlastimil ; Koníček, Petr ; Souček, Kamil ; Staš, Lubomír
Monitoring of the deformation stress state of the rock mass is a prerequisite for the verification of unapproved new mining methods hall-pillar and its further application in the Czech part of the Upper Silesian coal basin. This mining method is designed on the basis of experiences and practices that are verified in different natural conditions and depths below the surface and is therefore essential for the verification of conditions for the Czech part of the Upper Silesian Basin based on geotechnical monitoring. The present report is prepared on the basis of a contract no. 942/50/10, where the Institute of Geonics, v.v agrees to make periodic evaluation of monitoring data napěťodeformačního state of the rock mass. In accordance with the aforementioned agreement, the message is processed in the six-month period and continues in the interim report III / 2015 (Waclawik et al. 2015) passed buyers in April this year. Interim results of the geotechnical monitoring, such as the experience gained during the first conquest dobývky V show specifics of natural conditions in trial operation unapproved new mining methods hall-pillar.
Fulltext: content.csg - PDF
Plný tet: UGN_0464907 - PDF
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The study of the influence of the single entry and pillar mining method in seam No. 40 in Jan-Karel protective shaft pillar, location CSA Mining Plant 1 on Jan and shaft No. 2 downcast shafts and on the CSA 3 upcast air shaft, surface and surface objects
Ptáček, Jiří ; Kajzar, Vlastimil ; Koníček, Petr ; Kukutsch, Radovan ; Waclawik, Petr ; Jiránková, E.
The presented method single entry room and pillar solves the possibility of applying single entry room and pillar mining method, where roadheaders are used, newly in two variants. According to the first of them will be entries and intra-entries inundated with a time lag with fly ash mixtures. The second variant will be excavated only basic entries with a width of 6.8 meters. They will not be flooded. The purpose of the study is also adding calculations of potential and the expected impact of single entry room and pillar method on the surface and surface objects and also the expected impact on the shafts in Jan-Karel protective shaft pillar.
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