National Repository of Grey Literature 58 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Development of tools to minimise the risks of air contamination by respirable asbestos fibres released from the rock environment by human activities - summary research report on the progress and results of the project solution
Vavro, Leona ; Vavro, Martin ; Daněk, T. ; Kajzar, Vlastimil ; Drozdová, J. ; Raclavský, K. ; Kubina, Lukáš
The summary research report provides an evaluation of the procedure and results of the project SS01010257 - Development of tools to minimise the risks of air contamination by respirable asbestos fibres released from the rock environment by human activities (AZROCK). The solved project had two main objectives. The first one was the creation of two methodical instructions, both for the rock and aggregate sampling with a possible naturally occurring asbestos content and for the subsequent analysis of the presence of asbestos fibers in the samples taken. Furthermore, the project set itself the goal of creating: (1) a specialized map of the risk of asbestos occurrence in the rock environment in the Czech Republic and (2) a web knowledge portal of asbestos. A substantial part of the project solution was based on the collection of samples of rocks and aggregates at almost a hundred selected sites throughout the Czech Republic and their subsequent evaluation using a selected and verified set of analytical methods. Similar information on the occurrence of asbestos in the rock environment of the Czech Republic has not yet been available to interested professionals and the non-specialist public.
Evaluation of the risks of the terrain surface influencing from the point of view of geomechanical changes of the rock massif due to the flooding of the mining environment of the Ostrava and Petřvald sub-basins of the OKR by mine water - final report
Kajzar, Vlastimil
Attenuation of the remaining, still active mines of OKD company will mean the end of the primary reason for pumping mine water from mines, which is to ensure the safety of work and operation underground. At the same time, this eliminates the need to maintain the currently determined level of mine water in the already attenuated part of the Ostrava-Karviná district (OKR), i.e. in the Ostrava (ODP) and Petřvald (PDP) parts of the OKR, which are now ensured by the Jeremenko (ODP) and Žofie (PDP) water shafts. After the end of all activities in the OKR underground, the process of flooding of the abandoned mine could be started. The aim of this work is to determine the possible risks caused by geomechanical and rheological changes in the rock massif disturbed by mining activity and, above all, the associated possible risks of affecting the earth's surface.
Methodological guide for determining the presence of asbestos fibres in rocks
Daněk, T. ; Vavro, Leona ; Vavro, Martin ; Kajzar, Vlastimil ; Drozdová, J. ; Raclavský, K. ; Kubina, Lukáš
The content of the presented methodological procedure is guidance on a suitable and reliable method of laboratory analysis of rocks and crushed aggregate for the presence of naturally occurring asbestos. The created methodology follows on from the Methodological guide for sampling to determine the presence of asbestos fibers in rocks, with which it is closely linked. Together, they represent the first methodological documents dealing with the issue of asbestos in rocks and aggregates within the Czech Republic.
Evaluation of the risks of the terrain surface influencing from the point of view of geomechanical changes of the rock massif due to the flooding of the mining environment of the Ostrava and Petřvald sub-basins of the OKR by mine water - Interim report IV
Kajzar, Vlastimil
Attenuation of the remaining, still active mines of OKD company will mean the end of the primary reason for pumping mine water from mines, which is to ensure the safety of work and operation underground. At the same time, this eliminates the need to maintain the currently determined level of mine water in the already attenuated part of the Ostrava-Karviná district (OKR), i.e. in the Ostrava (ODP) and Petřvald (PDP) parts of the OKR, which are now ensured by the Jeremenko (ODP) and Žofie (PDP) water shafts. After the end of all activities in the OKR underground, the process of flooding of the abandoned mine could be started. The aim of this work is to determine the possible risks caused by geomechanical and rheological changes in the rock massif disturbed by mining activity and, above all, the associated possible risks of affecting the earth's surface.
Methodological guide for sampling to determine the presence of asbestos fibres in rocks
Vavro, Leona ; Vavro, Martin ; Kajzar, Vlastimil ; Daněk, T. ; Drozdová, J. ; Raclavský, K. ; Kubina, Lukáš
The content of the presented methodical procedure is guidance on a uniform method of sampling rocks and natural crushed aggregate potentially containing asbestiform particles. The created sampling procedure represents the first methodical document that deals with the issue of naturally occurring asbestos in rocks and aggregates within the Czech Republic.
Evaluation of the risks of the terrain surface influencing from the point of view of geomechanical changes of the rock massif due to the flooding of the mining environment of the Ostrava and Petřvald sub-basins of the OKR by mine water - Interim report III
Kajzar, Vlastimil
Attenuation of the remaining, still active mines of OKD company will mean the end of the primary reason for pumping mine water from mines, which is to ensure the safety of work and operation underground. At the same time, this eliminates the need to maintain the currently determined level of mine water in the already attenuated part of the Ostrava-Karviná district (OKR), i.e. in the Ostrava (ODP) and Petřvald (PDP) parts of the OKR, which are now ensured by the Jeremenko (ODP) and Žofie (PDP) water shafts. After the end of all activities in the OKR underground, the process of flooding of the abandoned mine could be started. The aim of this work is to determine the possible risks caused by geomechanical and rheological changes in the rock massif disturbed by mining activity and, above all, the associated possible risks of affecting the earth's surface.\n
Evaluation of the risks of the terrain surface influencing from the point of view of geomechanical changes of the rock massif due to the flooding of the mining environment of the Ostrava and Petřvald sub-basins of the OKR by mine water - Interim report II
Kajzar, Vlastimil
Attenuation of the remaining, still active mines of OKD company will mean the end of the primary reason for pumping mine water from mines, which is to ensure the safety of work and operation underground. At the same time, this eliminates the need to maintain the currently determined level of mine water in the already attenuated part of the Ostrava-Karviná district (OKR), i.e. in the Ostrava (ODP) and Petřvald (PDP) parts of the OKR, which are now ensured by the Jeremenko (ODP) and Žofie (PDP) water shafts. After the end of all activities in the OKR underground, the process of flooding of the abandoned mine could be started. The aim of this work is to determine the possible risks caused by geomechanical and rheological changes in the rock massif disturbed by mining activity and, above all, the associated possible risks of affecting the earth's surface.
Convergence measurement of CSM Sever vent shaft and mining work No. 292291 on 3rd floor in connection with the mining of the face No. 292 200/2 using 3D terrestrial laser scanner 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 works in order to capture spatio-temporal and dynamic changes in connection with the mining of longwall face No. 292 200/2. The subject of the use of terrestrial laser scanning technology was to capture the current spatial situation of of the approximately 200 m long section of corridor No. 29229. Furthermore, the spatial state of vent pit on the 3rd floor of the CSM Sever mine and its adjacent surroundings was also a subject of interest. The project here continuously follows on from the previous long-term monitoring carried out as part of contractual research with OKD, a. s. in 2020-2021 - Convergence measurement of CSM Sever vent shaft and adjacent surroundings on 3rd floor using 3D terrestrial laser scanner technology.\n
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.
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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