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Calculation of Residual Surface Subsidence Above Abandoned Longwall Coal Mining

by 1,*, 1,2,*, 1,3, 4 and 5
1
Institute of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
2
Institute of Mining and Surveying, Hebei University of Engineering, Handan 056038, China
3
Land Resources Survey and Monitoring Institute of Ningxia Hui Autonomous Region, Yinchuan 750002, China
4
School of Resources and Environmental Science, Shijiazhuang University, Shijiazhuang 050035, China
5
School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China
*
Authors to whom correspondence should be addressed.
Sustainability 2020, 12(4), 1528; https://doi.org/10.3390/su12041528
Received: 1 February 2020 / Revised: 14 February 2020 / Accepted: 17 February 2020 / Published: 18 February 2020
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. View Full-Text
Keywords: longwall coal mining; residual surface subsidence; quantitative prediction; stability; land reclamation; ecological reconstruction longwall coal mining; residual surface subsidence; quantitative prediction; stability; land reclamation; ecological reconstruction
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MDPI and ACS Style

Cui, X.; Zhao, Y.; Wang, G.; Zhang, B.; Li, C. Calculation of Residual Surface Subsidence Above Abandoned Longwall Coal Mining. Sustainability 2020, 12, 1528. https://doi.org/10.3390/su12041528

AMA Style

Cui X, Zhao Y, Wang G, Zhang B, Li C. Calculation of Residual Surface Subsidence Above Abandoned Longwall Coal Mining. Sustainability. 2020; 12(4):1528. https://doi.org/10.3390/su12041528

Chicago/Turabian Style

Cui, Ximin, Yuling Zhao, Guorui Wang, Bing Zhang, and Chunyi Li. 2020. "Calculation of Residual Surface Subsidence Above Abandoned Longwall Coal Mining" Sustainability 12, no. 4: 1528. https://doi.org/10.3390/su12041528

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