A New Gob-Side Entry Layout Method for Two-Entry Longwall Systems
Copyright policy )A New Gob-Side Entry Layout Method for Two-Entry Longwall Systems
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.
- UNSW Sydney Australia
- State Key Laboratory of Coal Resources and Safe Mining China (People's Republic of)
- Jiangsu University of Science and Technology China (People's Republic of)
- Xi'an University of Science and Technology China (People's Republic of)
- Jiangxi University of Science and Technology China (People's Republic of)
Technology, 330, T, anzsrc-for: 51 Physical sciences, pre-backfill, 4019 Resources Engineering and Extractive Metallurgy, gob-side entry, 620, anzsrc-for: 40 Engineering, anzsrc-for: 02 Physical Sciences, pillarless mining, entry stability, anzsrc-for: 33 Built environment and design, anzsrc-for: 4019 Resources Engineering and Extractive Metallurgy, 4005 Civil Engineering, anzsrc-for: 09 Engineering, anzsrc-for: 4005 Civil Engineering, 40 Engineering
Technology, 330, T, anzsrc-for: 51 Physical sciences, pre-backfill, 4019 Resources Engineering and Extractive Metallurgy, gob-side entry, 620, anzsrc-for: 40 Engineering, anzsrc-for: 02 Physical Sciences, pillarless mining, entry stability, anzsrc-for: 33 Built environment and design, anzsrc-for: 4019 Resources Engineering and Extractive Metallurgy, 4005 Civil Engineering, anzsrc-for: 09 Engineering, anzsrc-for: 4005 Civil Engineering, 40 Engineering
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