Górnictwo i Geoinżynieria
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ISSN 1732-6702
Issue Date
2005
Volume
R. 29
Number
Nr 3
Description
Journal Volume
Górnictwo i Geoinżynieria
R. 29 (2005)
Projects
Pages
Articles
Metoda udarowego hydraulicznego szczelinowania górotworu za pomocą strzelań odpalanych w otworach wypełnionych wodą pod ciśnieniem w aspekcie zwalczania zagrożenia tąpaniami
(Wydawnictwa AGH, 2005) Krawiec, Alfons
Ali methods of reducing rock-bump hazard in our coalmines are important and up-to-date and as such should be permanently and consistently developed and improved using the latest achievements in science and mining technology in this field. This applies particulary to combating rock-bump with active methods. The author discussed in details selected comments on methods of active rock-bump hazard reduction with shock blasting and infusion of water under pressure into the rock mass indicating their Iow effectiveness and reliability. Hence, the author proposed radical solution of this problem consisting in aggressive increase of applying technical means to rock mass. This aim was achieved by combining into one procedure two methods of active rock-bump hazard reduction that were used separately so far, that is shock blasting and forcing water under pressure. The original method of active reduction of rock-bump hazard established in this way was called the method of percussive hydraulic fracturing of rock mass with blasting fired in blast holes filled with water under pressure. The essence and mechanism of this method were described in details. The method under discussion applied for methane drainage of the seam 501/510 in »Wesoła« Coal Mine produced sensational results, that is fifteen fold increase of methane emission from methane drainage borehole, keeping the same conditions during the time of conducting the experiment. Therefore the author of this paper proposes to apply this method also to reducing rock-bump hazards.
Oddziaływanie powietrznej fali uderzeniowej na otoczenie
(Wydawnictwa AGH, 2005) Machowicz, Michalina
Using explosives in blastic technique and demolishing works are connected with disadvantageous influence on the surroundings. Besides the following threats: para-seismic vibrations, dispertion of rocky pieces, dustiness, the air shock wave is also created. The method of its range determination has been regulated within a suitable rule. However, that method may be applied in general terms. There only the mass of explosive load and the depth of its putting into the rock have been taken into consideration. However, there are some factors influencing the range, which haven't been included. The performed researches has confirmed supposition, that explosives with different capacities generate waves with different values of pressure. Thus, it seems to be reasonable to complete the applied methods the air shock wave parameters determination and also its range of activity with the influence of a given type of detonated explosive.
Problemy zabezpieczeń górniczych podczas penetracji i udostępniania grobowców skalnych w Egipcie oraz ich stabilizacja
(Wydawnictwa AGH, 2005) Pawlikowski, Maciej ; Mikoś, Tadeusz; Chmura, Janusz; Lasoń, Andrzej
The geotechnical and geological site characterisation in the vicinity of the Hatszepsut temple in Deir el-Bahari (Upper Egypt) was performed by the AGH team. That was a part of a special research program performed by AGH workers. The fore-shafts and inclined drifts for sarcophagus transport to thumb caverns are dig out during archeological process. These excavations were usually intentionally buried. With passing millenniums, soil material was compacted and formed a wall pillar. That's why, it's very important to prepare the range of investigating and penetrating works and to identify scale of the potential hazards. It's necessary to get access to ancient caverns for scientists and tourists.
Closure and aftercare regime for landfills below the water table
(Wydawnictwa AGH, 2005) Rapthel, Martina
The closure and after care regime for landfills below the water table is discussed. Basic conditions and variants established for the environment-compatible closure and after-care of sub-aquatic landfills were developed and investigated. The German landfill 'Halle-Lochau' is a typical example of such a landfill in a former open cast mining. The optimal solution determined by the research project will be the basis for the closure regime of the Halle-Lochau landfill. Furthermore, in the framework of the generalization of research results it shall also be applicable to other landfills with similar site requirements and starting conditions.
Funkcje zmiennych losowych - możliwości redukcji modeli stochastycznych. Cz. 2
(Wydawnictwa AGH, 2005) Snopkowski, Ryszard
This paper contain consideration about described the possibility of reduction of stochastic models by usage functional relationships, which can occur between random variables in model. Functional relations were also described, which as outcome schedule gave normal distribution, log-normal distribution, t-Student distribution and exponential distribution. In first part of publication, the outcome distribution were: beta, chi-square, Cauchy, F-Snedecor, gamma and uniform. The usage of described functions of random variables in stochastic model, can have the profitable influence on its further utilization, through the simplification of its record in figure of computer programme and the shortening of the stochastic simulation process.