Degradation of dam reservoirs under the influence of mining subsidence in Upper Silesian Coal Basin, South Poland

2021 ◽  
Vol 26 (4) ◽  
Author(s):  
Joanna Kidawa ◽  
Tadeusz Molenda
Keyword(s):  
Mining Subsidence ◽  
Coal Basin ◽  
Upper Silesian Coal Basin ◽  
Dam Reservoirs

scholarly journals Phosphorus Content in Deposits of Zofiówka Monocline (Sw Part of the Upper Silesian Coal Basin)

2014 ◽  
Vol 30 (2) ◽  
pp. 67-83 ◽  
Author(s):  
Marek Marcisz
Keyword(s):  
Phosphorus Content ◽  
Coal Basin ◽  
Upper Silesian Coal Basin

Streszczenie Przeprowadzono charakterystykę zmienności zawartości fosforu w 29 pokładach węgla kamien- nego złóż Pniówek i Zofiówka, występujących na monoklinie Zofiówki. Dokonano tego na podstawie utworzonej cyfrowej bazy danych obejmującej 2730 próbek, spośród których w 1674 oznaczono zawartość tego pierwiastka. Przeprowadzono podstawowe analizy statystyczne, za pomocą których określono m.in. liczbę próbek, w któiych oznaczono zawartość fosforu w poszczególnych pokładach, a także minimalną, maksymalną oraz średnią zawartość tego pierwiastka w danym pokładzie. Prześledzono zmiany zawartości fosforu w układzie horyzontalnym (w dwóch kierunkach: E-W oraz N-S) i wertykalnym (wraz z głębokością). Wykreślono także mapy izolinii zawartości fosforu we wszystkich badanych pokładach węgla. Wyniki badań wykazały, że zawartość fosforu w badanych pokładach złóż monokliny Zofiówki zmienia się w szerokim zakresie od 0,001 do 0,550% Pa (śr. 0,064%). Występuje w nich zatem węgiel o stosunkowo wysokiej - niekorzystnej przy produkcji koksu - zawartości fosforu. Najniższymi zawartościami tego parametru odznaczają się pokłady 417/1, 418/1-2, 502/1 oraz 505/1, najwyższymi natomiast -362/1 i 406/1. Nie wykazano żadnej ogólnej tendencji zmian zawartości fosforu. W każdym z pokładów obserwuje się odmienny charakter tych zmian. Nie stwierdzono także żadnego powiązania z przynależnością stratygraficzną.

Volcanoclastic minerals of some Czechoslovakian tonsteins and their alteration

Clay Minerals ◽  
1992 ◽  
Vol 27 (3) ◽  
pp. 269-282 ◽  
Author(s):  
Z. Weiss ◽  
A. Baronnet ◽  
M. Chmielova
Keyword(s):  
Coal Seams ◽  
Coal Basin ◽  
Upper Carboniferous ◽  
Upper Silesian Coal Basin ◽  
Mineral Assemblages ◽  
Clayey Rocks ◽  
Quartz Grains

AbstractIn the Czechoslovak part of the Upper Silesian Coal Basin (Ostrava-Karvina Coal Basin), only part of the Upper Carboniferous (Namurian A, B, C and Westphalian A) is well developed, and tonsteins, which are clayey rocks or claystones, occur as thin, clayey interlayers in the coal seams. Two types of primary volcanic mineral assemblages were identified in four tonstein samples from different coal seams; the first type is characterized by the presence of biotite and sanidine, and the second by the presence of biotite, bytownite and Ca-amphibole. All tonsteins studied contained kaolinite minerals, volcanic quartz grains, crystals of zircon and apatite. Separated biotite flakes with an admixture of kaolinite layers were identified as 1M polytype. The flakes without kaolinite minerals were identified as epitactic overgrowth of 1M and complex polytypes, and twinned crystals of 2M1 polytype. Kaolinization of biotite flakes was observed in all tonstein samples studied. Kaolinite single layers (7 Å) as well as two-layer polytype of kaolinite minerals (14 Å) sandwiched between biotite layers (10 Å) were identified by HRTEM imaging.

scholarly journals Changes In Cross-Sectional Area Of Gateroads In Longwalls With Roof Caving, Ventilated With “U” And “Y” Systems

2015 ◽  
Vol 60 (2) ◽  
pp. 549-564 ◽  
Author(s):  
Stanisław Prusek
Keyword(s):  
Ventilation System ◽  
Coal Pillar ◽  
Cross Sectional Area ◽  
Longwall Face ◽  
Sectional Area ◽  
The Finite Element Method ◽  
Coal Basin ◽  
Cross Sectional ◽  
Roof Caving ◽  
Upper Silesian Coal Basin

Abstract Content: In the paper results of measurements of underground gateroad deformations are presented. The measurements were conducted in seven collieries in the Upper Silesian Coal Basin. Altogether 28 gateroads were analysed:12 longwalls with „Y“ and 4 longwalls with „U“ ventilation system. Based on results of measurements, changes in cross-sectional area of gateroads were calculated and then referred to their original dimensions (when they were developed). Values of cross-sectional area of gateroads in front of and behind the longwall face are presented. Differences in deformation of gateroads in longwalls with the “U” ventilation system, surrounded by unmined coal, and/or goaf on one side were determined. Changes in cross-sectional area of reused gateroads, and newly driven ones (with a coal pillar separating the goaf from the working), were estimated. For gateroads of the longwalls with “Y” ventilation system their deformations at a distance of 200 metres behind the longwall face was determined. For selected gateroads their convergence was calculated with numerical modeling and a method developed at GIG. Calculations were made with Phase2 software based on the finite element method (FEM). Accuracy of forecasted gateroad deformations were assessed through comparing them with the results of underground measurements.

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