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Wyświetlanie 1-2 z 2
Tytuł:
Loads of sewer manholes within mining area
Autorzy:
Zięba, M.
Powiązania:
https://bibliotekanauki.pl/articles/91969.pdf
Data publikacji:
2014
Wydawca:
Główny Instytut Górnictwa
Tematy:
sewer manhole
load
mining area
studzienka kanalizacyjna
obciążenie
obszar górniczy
Opis:
Purpose The purpose of this paper is to present the method of taking into account additional external horizontal loads acting on sewer manholes within mining areas, caused by the impact of horizontal strains on the subsurface soil layer. Methods The determination of the dependencies of the changes in the cross-sections of flexible manholes’ riser pipes (with different circumferential stiffness) on the values of horizontal soil strains, based on laboratory tests. Results The results include formulas for determining the values of external horizontal loads acting on sewer manholes within mining areas, in particular flexible manholes made of thermoplastics. Practical implications The results will be used for the assessment of conditions in which sewer manholes can be used within mining areas – and will be beneficial when considering the following: design, protection and assessment of resistance to horizontal strains. Originality/ value The presented method is an original concept. It enables the determination of additional external horizontal loads acting on sewer manholes within mining areas, in particular the flexible manholes made of thermoplastics. It also enables the determination of dependencies of changes in the cross-sections of risers of flexible sewer manholes (with different circumferential stiffness) on the horizontal soil strains.
Źródło:
Journal of Sustainable Mining; 2014, 13, 4; 34-39
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatiotemporal interactions between surface coal mining and land cover and use changes
Autorzy:
Paraskevis, Nikolaos
Servou, Aikaterini
Roumpos, Christos
Pavloudakis, Francis
Powiązania:
https://bibliotekanauki.pl/articles/1839060.pdf
Data publikacji:
2021
Wydawca:
Główny Instytut Górnictwa
Tematy:
land cover/use change
surface mining
relative spatial indicator
transition matrix
GIS
active mining area
górnictwo odkrywkowe
względny wskaźnik przestrzenny
macierz przejścia
aktywny obszar górniczy
Opis:
Long-term surface mining and land cover/use changes have been evidenced to have a critical relationship. This study investigates the evolution of this relationship for Ptolemais (Northern Greece) coal mining area during the period 1990-2018. In this context, satellite images, Corine data, and mining maps were used. A relative spatial indicator (RSI) was adopted to describe the mineral land areas and ArcGIS tools to define the land cover and use changes. Furthermore, mine operation parameters were statistically analyzed concerning land cover/use areas. The study revealed that areas described as “mineral extraction sites” present a strong correlation with “non-irrigated arable land” and “transitional woodland”. From 1990 to 2018, the total forest area was increased by three times, mainly as a result of the dumping sites’ geometry. Additionally, the mine operation parameters are well correlated with the active mining area, and more specifically, there is a linear relationship between the stripping ratio and the ratio of lignite production to active mining area. In the general case, the calculated annual changing rate of land use types may contribute to the prediction of future land reclamation uses and, consequently, to land reclamation planning in due time.
Źródło:
Journal of Sustainable Mining; 2021, 20, 2; 72-89
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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