Analysis and treatment technology of gas emission anomaly from roof limestone

doi:10.16265/j.cnki.issn1003-3033.2019.08.013

Abstract

Abstract: In order to clarify the reasons for abnormal gas emission from roof limestone of a low gas mine in Lvliang mining area, gas content in the working seam and adjacent coal seams, water inflow in the roof fissure area, the ionic component of karst water and the gas concentration in the fissure were measured. Then causes of gas enrichment in roof limestone were analyzed considering the geological structure characteristics of gas anomaly gushing locations, and various treatment measures and effects were investigated. The research indicates that the plugging effect of limestone fissure water on the roof and the gas storage space formed due to the corrosion of interlayer fissure water on limestone dissolution are the reasons for abnormal gas emission from roof limestone, and using high-level drilling to extract the gas in limestone enrichment area can effectively decrease the gas emission of roadways, reduce gas concentration to ensure safe and efficient production in working face.

Key words: coal seam roof, limestone, fracture, gas enrichment, high-level drilling, roof drilling

CLC Number:

X936

LI Hong, MA Jinkui, DENG Qigen. Analysis and treatment technology of gas emission anomaly from roof limestone[J]. China Safety Science Journal, 2019, 29(8): 81-86.

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