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Analysis of Gas-Geodynamic Phenomena During the Preparatory and Mining Works in Seam 358/1 at KWK “Budryk”

Zmarzły Marian, Schubert Michał, Salamon Krystian

New Trends in Production Engineering

2020

Vol. 3, Iss. 1

131--148

The nature of gas-geodynamic phenomena is so complicated and unpredictable that it forces the necessity of continuous search for new principles of identifying the outburst threat and ongoing monitoring of this threat with view of current conditions in the mine. After the incidents in JSW S.A, the mines carrying out works in seams threatened with outbursts, upon their own initiative introduced additional rigours and increased the frequency of measurements and tests regardless of the existing legal requirements. Incidents that have taken place in KWK “Budryk” in recent years show how important is continuous verification of knowledge related to the forecasting of the outburst threat on the basis of ongoing observations of works. The local occurrence of a zone characterized by high methane-bearing capacity in the coal seam, even after taking preventive measures and introducing additional rigorous did not allow for the complete elimination of gas-geodynamic phenomena and avoidance of danger to employed people.

Phenomenological description of gas seepage in coal briquettes

Topolnicki J., Wierzbicki M.

Bulletin of the Polish Academy of Sciences. Earth Sciences

2000

Vol. 48, nr 1

75-84

The paper presents the results of studies on stationary gas seepage in coal briquettes of variable porosity. The measurement procedures are presented. Interpretation of the results is based on Darcy's law and two phenomenological formulae. Standard deviation from the plotted line representing the relationship between the real volumetric flow rate, and that derived from the relevant formulae, is taken as the measure of accuracy. In all cases considered here the phenomenological formulae prove to be more adequate for the description of gas seepage processes.