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| Research and application of gob-side entry retaining technology in hard roof and large mining height face of thick coal seam |
| Weng Yaojun |
| Shanxi Kaijia Energy Group Co., Ltd., Jinzhong 032000, China |
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Abstract Full height mining technology with large mining height was adopted in the sixth mining area in the north wing of Yitang mine. The mining height of the working face was 5 m, and the roof of the working face was limestone hard roof. The gob-side entry retaining technology was tested in the return airway of the working face. The roadway was up to 4 m high, the section is large and the roof of the roadway was left with 1.2 m thick No.9 coal. There was no example that can be used for reference in China to carry out gob-side entry retaining under such conditions. Through theoretical design and similar simulation research, a reasonable roadway retaining support method and gangue retaining scheme were obtained. The on-site mine pressure observation results showed that the roadway retention effect was good and the technical economy was reasonable. This roadway retaining scheme could be popularized and applied in mines with similar conditions.
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