Atypical evolution of seismicity patterns resulting from the coupled natural, human-induced and coseismic stresses in a longwall coal mining environment

2016 ◽  
Vol 86 ◽  
pp. 5-15 ◽  
Author(s):  
Maria Kozłowska ◽  
Beata Orlecka-Sikora ◽  
Łukasz Rudziński ◽  
Szymon Cielesta ◽  
Grzegorz Mutke
Keyword(s):  
Coal Mining ◽  
Seismicity Patterns ◽  
Mining Environment ◽  
Longwall Coal Mining

scholarly journals Calculation of Residual Surface Subsidence Above Abandoned Longwall Coal Mining

2020 ◽  
Vol 12 (4) ◽  
pp. 1528 ◽  
Author(s):  
Ximin Cui ◽  
Yuling Zhao ◽  
Guorui Wang ◽  
Bing Zhang ◽  
Chunyi Li
Keyword(s):  
Coal Mining ◽  
Longwall Mining ◽  
Land Reclamation ◽  
Surface Subsidence ◽  
Mining Subsidence ◽  
First Year ◽  
Longwall Coal Mining ◽  
The Stability ◽  
Ecological Reconstruction

Exhausted or abandoned underground longwall mining may lead to long-term residual subsidence on surface land, which can cause some problems when the mined-out land is used for construction, land reclamation and ecological reconstruction. Thus, it is important to assess the stability and suitability of the land with a consideration of residual surface subsidence. Assuming a linear monotonic decrease in the annual residual surface subsidence, the limit of the sum of the annual residual subsidence factor, and continuity between surface subsidence in the last year of the weakening period and the residual surface subsidence in the first year, we establish a model to calculate the duration of residual subsidence and the annual residual surface subsidence factor caused by abandoned longwall coal mining. The duration of residual surface subsidence increases with the increase in mining thickness as well as the factor of extreme residual subsidence. The proposed method can quantitatively calculate the annual residual subsidence, the accumulative residual subsidence, and the potential future accumulative residual subsidence. This approach can be used to reasonably evaluate the stability and suitability of old mining subsidence areas and will be beneficial for the design of mining subsidence land reclamation and ecological reconstruction.

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