LAPSE:2018.0606
Published Article
LAPSE:2018.0606
A New Gob-Side Entry Layout Method for Two-Entry Longwall Systems
Rui Wu, Qingyuan He, Joung Oh, Zecheng Li, Chengguo Zhang
September 21, 2018
The gob-side entry layout is popular at two-entry longwall mine sites in China for the benefit of improving the coal recovery rate. Currently, two methods have been widely used to develop gob-side entries, including gob-side entry retaining and gob-side entry driving. Gob-side entry retaining maximizes the recovery rate by pillarless mining but increases the difficulty in gob-side entry support. Also, this method has limited applications in hard roof conditions. The gob-side entry driving mine site uses the rib pillar to separate the gob entry and the gob area of the previous panel, which leads to additional coal losses. The waste is more intolerable in large-cutting-height panels and longwall top coal caving panels as the Chinese government limits the minimum recovery rate of longwall panels using these mining methods. In this paper, a new gob-side entry layout method, termed gob-side pre-backfill driving, is established to overcome the shortcomings of the existing methods. The new method eliminates rib pillar losses and enhances gob-side entry stability. The feasibility of gob-side pre-backfill driving is studied by numerical modelling and a field trial at Changcun Mine in China. The results indicate that gob-side pre-backfill driving is an alternative for gob-side entry development. This method is practical and also has the potential to bring significant economic benefits to the mining industry.
Keywords
entry stability, gob-side entry, pillarless mining, pre-backfill
Subject
Suggested Citation
Wu R, He Q, Oh J, Li Z, Zhang C. A New Gob-Side Entry Layout Method for Two-Entry Longwall Systems. (2018). LAPSE:2018.0606
Author Affiliations
Wu R: School of Resources and Environmental Engineering, JiangXi University of Science and Technology, Ganzhou 341000, China
He Q: State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Ming and Technology, Xuzhou 221116, China; School of Mining Engineering, Faculty of Engineering, University of New South Wales, Sydney 2052, Australia
Oh J: School of Mining Engineering, Faculty of Engineering, University of New South Wales, Sydney 2052, Australia
Li Z: School of Mining Engineering, Faculty of Engineering, University of New South Wales, Sydney 2052, Australia
Zhang C: School of Mining Engineering, Faculty of Engineering, University of New South Wales, Sydney 2052, Australia
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Journal Name
Energies
Volume
11
Issue
8
Article Number
E2084
Year
2018
Publication Date
2018-08-10
Published Version
ISSN
1996-1073
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Original Submission
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PII: en11082084, Publication Type: Journal Article
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LAPSE:2018.0606
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doi:10.3390/en11082084
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Sep 21, 2018
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CC BY 4.0
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Sep 21, 2018
 
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Calvin Tsay
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