Study of Key Technology of Gob-Side Entry Retention in a High Gas Outburst Coal Seam in the Karst Mountain Area

Zhenqian Ma, Dongyue Zhang, Yunqin Cao, Wei Yang and Biao Xu
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Zhenqian Ma: School of Mining, Guizhou University, Guiyang 550025, China
Dongyue Zhang: School of Mining, Guizhou University, Guiyang 550025, China
Yunqin Cao: School of Mining, Guizhou University, Guiyang 550025, China
Wei Yang: Guizhou Panjiang Coal and Electricity Group Technology Research Institute Co., Ltd., Guiyang 550081, China
Biao Xu: Guizhou Qianxi Honglin Mining Co., Ltd., Bijie 551500, China

Energies, 2022, vol. 15, issue 11, 1-21

Abstract: In the gob-side entry retaining by roof cutting (GERRC) technique, pressure is offloaded via directional roof cutting, and a roadway is automatically formed due to the ground pressure and rock-breaking expansion. To improve the application of the theory and technical system of GERRC in the Karst area in Southwest China, this research studies the key technology of GERRC in a high gas outburst coal seam, based on the engineering background of the 39114 working face of the Honglin coal mine. According to the geological conditions of the 39114 working face, by means of formula calculation, UDEC numerical modeling, and on-site drilling peeping, the optimal roof-cutting parameters suitable for the 39114 working face were determined: the roof cutting height was 7 m, the roof cutting angle was 15°, and the spacing of pre-splitting blasting holes was 600 mm. Additionally, the above roof-cutting parameters have achieved good results in the engineering practices of the 39114 transportation roadway, which shows that the technology of GERRC is feasible in high gas outburst mines and achieves the goal of safe and efficient mining.

Keywords: high gas outburst coal seam; pre-splitting blasting; gob-side entry retaining; roof cutting; UDEC simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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