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Energies 2018, 11(8), 2084;

A New Gob-Side Entry Layout Method for Two-Entry Longwall Systems

School of Resources and Environmental Engineering, JiangXi University of Science and Technology, Ganzhou 341000, China
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
Author to whom correspondence should be addressed.
Received: 24 June 2018 / Revised: 26 July 2018 / Accepted: 3 August 2018 / Published: 10 August 2018
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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. View Full-Text
Keywords: gob-side entry; pre-backfill; entry stability; pillarless mining gob-side entry; pre-backfill; entry stability; pillarless mining

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Wu, R.; He, Q.; Oh, J.; Li, Z.; Zhang, C. A New Gob-Side Entry Layout Method for Two-Entry Longwall Systems. Energies 2018, 11, 2084.

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