Górnictwo i Geoinżynieria
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ISSN 1732-6702
Issue Date
2008
Volume
R. 32
Number
Nr 1
Description
Journal Volume
Górnictwo i Geoinżynieria
R. 32 (2008)
Projects
Pages
Articles
Przestrzenna analiza numeryczna wytężenia filarów komór solnych pola eksploatacyjnego Pagory w otworowej Kopalni Soli »Barycz«
(Wydawnictwa AGH, 2008) Cieślik, Jerzy; Flisiak, Danuta; Flisiak, Jerzy; Mazurek, Jakub
This paper presents results of the three dimensional, geometrical and numerical modeling of cavern layout in the Pagory region of Barycz salt mine excavation region. In the first part of the paper authors perform 3D geological and mining situation geometrical model and prepare the whole region cavern representation. The stress and strength distribution maps obtained from numerical analysis allowed evaluation of strength of the salt pillars and regions of high probability of caverns hydraulic connectivity. Finally, a numerical calculations result was compared with mining caverns hydraulic connectivity investigations.
Detekcja anizotropii teksturalnej w piaskowcach fliszowych za pomocą prostych technik komputerowej analizy obrazu
(Wydawnictwa AGH, 2008) Domonik, Andrzej
The study presents the results of investigations of joints surface texture obtained during indirect tensile strength tests on oriented samples of cergowskie sandstones. The techniques and method of quantitative analysis of crack roughness using fractal dimension were presented. Computed values of fractal dimension of precise specified, forced failure surfaces, were compared with directions of natural joints measured in terrain.
Określenie niszczącej strefy wpływów dla zjawisk sejsmicznych
(Wydawnictwa AGH, 2008) Drzewiecki, Jan
The article describes a method to calculate the range of a destructive influence area for seismic events, that is the area where destruction of working may occur. The basis for calculation of this range was the analysis of selected parameters of documented tremors which had taken place between 1990 and 2006. In the calculations a method of forecasting of seismic energy dependent on the intensity of exploitation with focus of tremors located in the front of coalface. Calculations were made for zones which size assumes probability of 20%, 50% and 80% of working destruction. Also an example of calculations for exploitation of a coal seam 750 meters below ground has been given.
Wybrane własności węgli w rejonach zagrożonych wyrzutami metanu i skał
(Wydawnictwa AGH, 2008) Dutka, Barbara; Wierzbicki, Mirosław
Two sudden outbursts of gas and coal have occurred in the hard coal mine »Zofiówka« in the Upper Silesian Coal Basin (USCB - Poland) last years. Both incidents took place in a district which had been acknowledged hitherto as a not endangered by that kind of hazard. It seems that the outbursts in USCB have a local nature and their incidence is connected with presence of geological disturbances in the rock mass. This paper summarises some results of the following laboratory measurements carried out for coals from the »Zofiówka« hard coal mine: sorptive properties of coal, their porosity and gas capacity. Coals of modified structure were tested and the tests results were compared with results obtained for coals of normal structure. Some obtained results show that coals of modified structure have higher gas capacity and diffusion coefficient than their non-modified counterparts as well as they have high porosity and low conciseness. These properties may cause a significant increase of gas and coal outburst hazard in the areas where coals of modified structure occur. Obtained results allow to understand better the mechanism of coal fracture and can lead to increase of safety of coal exploitation.
Analiza obrazów sekcji pseudoimpedancji akustycznej
(Wydawnictwa AGH, 2008) Figiel, Włodzimierz; Kawalec-Latała, Ewa
Approximate distribution of acoustic pseudo-impedance can be obtained from calculation of inversion of the seismic section. That data of the acoustic resistance distribution are the base to image creation and visual interpretation of surrounding rock morphology. That method is useful for lithology-phacial changes detection in case that the changes have response in acoustic resistance changes. In practice, high-level noise signal in coexistence with useful one, make interpretation difficult, if not even impossible. In the paper are suggested some methods of image analysis and processing to inhance the acoustic impedance image feature visualization. That is the way to increase image interpretation credibility in process of lithology-phacial change detection in salt deposits.