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Title: Determination of elastic parameters of near-surface layers over subsidence trough development during longwall exploitation
Other Titles: Wyznaczenie parametrów sprężystych płytkiego ośrodka geologicznego nad wykształcającą się niecką obniżeniową
Authors: Mendecki, Maciej J.
Jochymczyk, Krzysztof
Zuberek, Wacław M.
Tomaszewska, Radosława
Keywords: shallow seismics; wave velocity anisotropy; shear modulus; attenuation; subsidence trough; underground coal mining
Issue Date: 2017
Citation: Archives of Mining Sciences, Vol. 62, iss. 4 (2017), s. 705-716
Abstract: Seismic and geodetic studies were carried out before, during, and after underground exploitation of a coal bed in Katowice – Kleofas Coal Mine, located in the Upper Silesia Coal Basin, Poland. Development of a subsidence trough was completed approximately 3 months after passage of a longwall exploitation in the coal seam. This was the time required for the subsidence trough to appear on the surface, which was confirmed by levelling measurements. Sharp changes in the elastic parameters were observed on each profile during subsidence trough development. This observation can result from changing tension and compression forces caused by increase and/or decrease of the elastic parameters of the rock mass. After completion of subsidence trough development, the rock mass appeared to return to its isotropic state and the observed changes ceased. Some minor fluctuations were noted, but they probably resulted from changes in groundwater levels, which might have affected the measured parameters.
DOI: 10.1515/amsc-2017-0050
ISSN: 0860-7001
Appears in Collections:Artykuły (WNP)

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