Browsing by Subject "lignite mine"

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Access status: Open Access ,
Model przepływu wód podziemnych dla zwałowiska nadkładu z odkrywkowej kopalni węgla brunatnego
(2008) Wiencław, Edward; Marek, Zbigniew; Kaczarewski, Tadeusz; Koda, Eugeniusz
The paper presents the example of numerical modelling of groundwater flow during dewatering of excavation in the lignite open pit mine. Sufficient cubic capacity for overburden soils is necessary to continue operation of the lignite mine in Turów site. The FEMWATER model of the overburden bank from the lignite open pit mine consists computer solution of groundwater flow for the design of the overburden heap in this site. The basis of numerical solution was the problem of groundwater flow described by Richard's equation, using 3-D finite elements method. The main, sophisticated purpose of the modelling carried out, taking into consideration this model, was the prediction of underflooding of the overburden bank and its surroundings. Modelling test results of the groundwater flow will be applied for extension of dewatering system and the design of monitoring system of potential threat of the overburden bank stability, constructed in the close vicinity of protected objects. The main objects which need special protection during overburden bank construction and dewatering are: the bank of Nysa Łużycka River, international road and industrial infrastructure around TURÓW lignite open mine. The modelling results also will be applied in designing of adequate technical safety solutions to protect these objects.
Access status: Open Access ,
Występowanie metanu w złożu węgla brunatnego KWB „Bełchatów” S.A.
(2005) Macuda, Jan; Zawisza, Ludwik
Gases in coal-bearing strata are accumulated both in the coal structure and in the pores of the accompanying rocks. They may take the form of free gases present in the fractures and porous spaces, or may be adsorbed in coal. Free gases make up ca. 1 to 5% of volume of all gases accumulated in the exploited coal seams. The authors present results of many years' analyses of methane concentration within the opencast KWB Bełchatów S.A. accounting for the geological conditions and advancement of mining works. Methane emission to the atmosphere greatly depends on dewatering of the field and the magnitude of the mined overburden and advancement. Dewatering of the rock mass preconditions methane migration through a system of fractures, pores with developed hydraulic contacts and fault zones. Another important factor responsible for increased methane emission is relaxation of the deposit strata while removing the overburden. This has been shown on the maps of changes methane concentration in the opencast area.