Improving recovery in sublevel top coal caving mining by using partially reverse drawing technique

Jinwang Zhang; Dongliang Cheng; Jiachen Wang; Shengli Yang; Xiaohang Wan; Xinyang Li

International Journal of Mining Science and Technology (Dec 2024)

Improving recovery in sublevel top coal caving mining by using partially reverse drawing technique

Jinwang Zhang,
Dongliang Cheng,
Jiachen Wang,
Shengli Yang,
Xiaohang Wan,
Xinyang Li

Affiliations

Jinwang Zhang: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; Key Laboratory of Xinjiang Coal Resources Green Mining, Ministry of Education, Xinjiang Institute of Engineering, Urumqi 830023, China; Engineering Research Center of Green and Intelligent Mining for Thick Coal Seam, Ministry of Education, Beijing 100083, China
Dongliang Cheng: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; Engineering Research Center of Green and Intelligent Mining for Thick Coal Seam, Ministry of Education, Beijing 100083, China
Jiachen Wang: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; Engineering Research Center of Green and Intelligent Mining for Thick Coal Seam, Ministry of Education, Beijing 100083, China; Corresponding author.
Shengli Yang: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; Engineering Research Center of Green and Intelligent Mining for Thick Coal Seam, Ministry of Education, Beijing 100083, China
Xiaohang Wan: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; Engineering Research Center of Green and Intelligent Mining for Thick Coal Seam, Ministry of Education, Beijing 100083, China
Xinyang Li: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; Engineering Research Center of Green and Intelligent Mining for Thick Coal Seam, Ministry of Education, Beijing 100083, China

Journal volume & issue: Vol. 34, no. 12
pp. 1655 – 1676

Abstract

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The sublevel top coal caving (SLTCC) mining technology is extensively employed in steeply inclined thick coal seams. Because of the typical characteristics of the short coal face in this mining method, a significant portion of the top coal is lost at the face end. For reducing the coal loss, the partially reverse drawing technique (PRDT) is proposed as a novel top coal drawing technique. Meanwhile, based on the Bergmark-Roos model (B-R model), a theoretical method for calculating the recovery ratio of top coal based on the top coal boundary equation and residual top coal amount is proposed. The mechanism of PRDT to reduce top coal loss at the face end is revealed by comparing with single-round sequential drawing technique (SSDT). Physical experiments and in-site observation data were used to verify the theoretical model. The results show that PRDT can effectively reduce the amount of residual coal near the roof by optimizing the shape characteristics of top coal boundary. Suggestions for improve recovery ratio in Wudong Coal Mine were given based on its face parameters.

Published in International Journal of Mining Science and Technology

ISSN: 2095-2686 (Print); 2589-062X (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/international-journal-of-mining-science-and-technology

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