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1 Journal of Sustainable Mining

1 2024

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Study on law and influencing factors of air leakage in isolated island working face with large burial depth

Wang Gang, Xia Mingze, Xie Shuliang, Xu Hao, Wang Shuxin, Deng Xintai

Journal of Sustainable Mining

2024

Vol. 23, iss. 3

315--326

During the mining of a single coal seam isolated island work surface with large burial depth, the high mine pressures can crush and break the protective coal pillars, causing serious air leakages in the rear goaf. Herein, we use the analytic hierarchy process(AHP) to determine the main influencing factors of air leakage in island mining face. The air leakage source and sink in goaf were determined by measuring the differential pressures between the island mining face and the adjacent goaf using the energy level measurement method. The air volumes in the roadways were monitored on site to quantitatively analyze the specific changes of the air leakage in the isolated island work surface. Finally, the air leakage prevention measures were evaluated for the air leakage reduction efficiency in the island mining face and the goaf. Research shows that: (1) The fissure development in the roadway wall is the main influencing element of the air leakage in the isolated island work surface; (2) The differential pressure causes the air leakage volume of 37-40 m3/ min from the goaf to the island mining face; (3) Shotcrete in the gob-side roadway of the isolated island work surface can reduce the air leakage by 78%.