|
| |
|
|
Speed Increasing for Track Section Bojkovice-Bohuslavice nad Vláří
Ptáček, Jiří ; Hoza, Miroslav (referee) ; Svoboda, Richard (advisor)
This thesis will examine possibilities of increse speed on a railway track section between Bojkovice - Bohuslavice nad Vláří. The increase of speed will examined according to contemporary geometric parameters of the railway track and with proposed changes of geometric parameters of the railway track. The proposed changes cannot profoundly transformate the body of the railway track. In both cases a restriction of speed by level crossing, a track branching ect. will be taken into consideration or will propose changes of these objects.
|
|
|
Stress state rock mass monitoring ahead of longwall No. 371 202 at 2ndA block, Mine Plant 2, OKD, a.s
Waclawik, Petr ; Ptáček, Jiří ; Koníček, Petr ; Vavro, Martin ; Staš, Lubomír ; Souček, Kamil ; Kukutsch, Radovan ; Kajzar, Vlastimil
Generally, the accurate knowledge of the stress strain state of the rock mass in the neighbourhood of the mining galleries and underground openings is absolutely critical for their precise support designing, not only in the vicinity of them, but also at a greater distance from them if the phenomenon affecting the rock mass stress fields occurs. Measurement (investigation) of the rock stress is usually carried out by interpretation of the rock mass deformation processes, which can be relatively precisely observed and measured. The roadways are loaded not only by rock pressures in the front of the coalfaces but also by destress blasting realised in the overburden rock seam in the scope of the rockburst prevention. In addition, the rock stress distribution is influenced by old mining activities too, for example by abandoned coal pillars in the seams in overburden, respectively by goaf in the excavated seam. All of these factors can significantly affect the stress-strain behaviour of the rock mass around the mining works.
|
|
|
Stress state rock mass monitoring ahead of longwall No. 371 202 at 2ndA block, Mine Plant 2, OKD, a.s
Waclawik, Petr ; Ptáček, Jiří ; Koníček, Petr ; Vavro, Martin ; Staš, Lubomír ; Souček, Kamil ; Kukutsch, Radovan ; Kajzar, Vlastimil
Generally, the accurate knowledge of the stress strain state of the rock mass in the neighbourhood of the mining galleries and underground openings is absolutely critical for their precise support designing, not only in the vicinity of them, but also at a greater distance from them if the phenomenon affecting the rock mass stress fields occurs. Measurement (investigation) of the rock stress is usually carried out by interpretation of the rock mass deformation processes, which can be relatively precisely observed and measured. The roadways are loaded not only by rock pressures in the front of the coalfaces but also by destress blasting realised in the overburden rock seam in the scope of the rockburst prevention. In addition, the rock stress distribution is influenced by old mining activities too, for example by abandoned coal pillars in the seams in overburden, respectively by goaf in the excavated seam. All of these factors can significantly affect the stress-strain behaviour of the rock mass around the mining works.
|
|
|
Dílčí zpráva II/2015 Hodnocení monitoringu napěťodeformačního stavu horninového masivu při dobývání sloje 30(634) v rámci zkušebního provozu dobývací metody chodba-pilíř v OPJ Dolu ČSM - Sever
Waclawik, Petr ; Ptáček, Jiří ; Kukutsch, Radovan ; Kajzar, Vlastimil ; Koníček, Petr ; Souček, Kamil ; Staš, Lubomír
Monitoring napěťodeformačního stavu horninového masivu je nezbytným předpokladem pro ověření nové neschválené dobývací metody chodba-pilíř a jejího dalšího použití v podmínkách české části hornoslezské uhelné pánve. Tato dobývací metoda je projektována pouze na základě zkušeností a postupů, které jsou ověřeny v odlišných přírodních podmínkách a hloubkách pod povrchem a proto je nezbytná její verifikace pro podmínky české části hornoslezské pánve na základě geotechnického monitoringu. Předkládaná zpráva je zpracována na základě smlouvy o dílo č. 942/50/10, kde se Ústav Geoniky AV ČR, v.v.i. zavazuje provádět pravidelné vyhodnocování dat monitoringu napěťodeformačního stavu horninového masivu. V souladu s výše uvedenou smlouvou, je zpráva zpracována v 6-ti měsíčním intervalu a navazuje tak na dílčí zprávu I/2015 (Waclawik et al. 2015) předanou odběrateli v dubnu tohoto roku. Průběžné výsledky geotechnického monitoringu, tak jak zkušenosti získané v době dobývání první dobývky V, ukazují na specifika přírodních podmínek v lokalitě zkušebního provozu nové neschválené dobývací metody chodba-pilíř.
|
|
|
Methodical instruction for effectiveness evaluation of destress blasting GM/15/UCIN
Koníček, Petr ; Čížek, P. ; Ptáček, Jiří ; Stoniš, M. ; Przeczek, A.
Rock bursts are one of the most dangerous phenomena occurring in coal mining in the Czech part of the Upper Silesian Coal Basin. In these terms, destress blastings belong to the most important of prevention measures. Seismic effects (as an indicator of stress release) represent the ratio of seismic energy released in the rock mass when blasting to the considered energy of the particular detonated chargé. The methodology is a result of ananalysis of a large data set of destress blastings from rock mass and seismological monitoring data collected over the period 2000 - 2013. A new, respectively verified rating system for evaluation of the effectiveness of destress blastings using the registered seismic energy is the basement of the methodology. The methodology determines to experts of underground hardcoal mining for procedure of effectiveness evaluation of destress blasting operations carried out in the rockburst prevention.
|
|
| |
|
|
The introductory view on the pressure load in the underground storage in the exploration zone Milasín-Bukov
Koníček, Petr ; Ptáček, Jiří ; Souček, Kamil ; Staš, Lubomír ; Vavro, Martin ; Waclawik, Petr
The report was prepared as the preliminary opinion on the pressure load resistance of the rock mass inside the gas storage Milasín-Bukov. It comprised the data summary and analysis, which were gained by measuring in mine or by laboratory tests. Rock and rock-mass parameters were obtained by deformation and/or stress/strain monitoring in the roadways in the mine using the index RMR or Q characterized the rock quality. The mechanical and stress/strain conditions were tested in labor on selected rock samples. The rock mass resistance to gas pressure inside the gas storage was determined based on the methodology stress strain in-situ measurements in the before driven roadways in the similar rock-mass conditions. The results were compared with the results of mathematical model.
|
|
| |
|
|
Methodical instructions for secure stability of mine roadways in great depth
Koníček, Petr ; Šňupárek, Richard ; Konečný, Petr ; Ptáček, Jiří ; Kukutsch, Radovan ; Kajzar, Vlastimil ; Waclawik, Petr ; Souček, Kamil ; Staš, Lubomír ; Hortvík, Karel ; Konečný, Pavel
Methodology provides instructions for safe and economic design of roadways for mining and mining design companies in conditions of the Czech part of the Upper Silesian Coal Basin. Methodology covers area of all used roadway support as a steel arch support, rock bolt and cable bolt support as well as methods of grouting for stability and reinforcement of roadways.
|
guest ::
RSS feed.