Browsing by Author "Dutka, Barbara"

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Access status: Open Access ,
Określenie ciśnienia złożowego metanu na podstawie pomiarów metanonośności oraz badań sorpcyjnych węgla na przykładzie KWK »Krupiński«
(Wydawnictwa AGH, 2009) Dutka, Barbara; Walaszczyk, Jan; Wierzbicki, Mirosław
The coal seam methane pressure seems to be a main parameter which is necessary for evaluating the probability of occurrence of some hazards in hard coal mine industry. An in situ measurement of this parametere is very difficult, so it was necessary to find an indirect method of such measurements. The laboratory method is generally based on the shape of the isotherm of the total methane content in the examined coal. The coal for the laboratory tests should be collected from a place in a coal bed where the methane content is well known. This paper presents an application of the worked out method to the estimation of the coal seam methane pressure level in the coal mine »Krupiński«.
Access status: Open Access ,
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.