Dynamics of gas release in highly gassy close-spaced coal seam mining
Usenbekov M.S. Isabek T.K. Zhaparova S.B. Alpysbaeva Z.H.
2023Ore and Metals Publishing house
Gornyi Zhurnal
2023#2023Issue 360 - 66 pp.
The occurrence conditions of coal seams in the Karaganda Coal Basin feature mostly complex geodynamics and gas dynamics. The local mines combat high-rate gas emission and coal and gas outbursts. Prevention of hazardous events of gas dynamics uses various techniques. The most effective prevention technique in case of coal and gas outbursts includes relaxation of coal seams from stresses and gas drainage during advanced cutting of neighbor protective seams. Efficiency of this approach depends on the protective seam parameters (thickness, spacing of the protected and protective seams, composition and properties of rocks in this parting, roof control method). As the depth of underground coal mining grows, the absolute and relative values of methane emission in mined-out voids increase. This study reviews some hypotheses and expert opinions which differently explain the mechanism of outgassing in closely spaced coal seams. On that basis, the objective was set to analyze gas release dynamics in mined-out void from closely spaced coal seams and from their partings, along cracks in highly gassy coal mining in the Karaganda Basin. To that end and for defining efficiency of gas drainage methods and flow charts, in-situ tests were carried out in six longwalls in three mines of ArcelorMittal Temirtau. The research findings and the conclusions made are recommended for the mining safety assessment in the similar conditions of geodynamics and gas dynamics, as well as for the development of practical measures for gas emission reduction and control in mining highly gassy and outburst-hazardous coal seams.
Closely spaced seams , Coal and gas outbursts , Degassing , Gas emission dynamics , Highly gassy coal seams , Mined-out void , Safety , Undermining and overmining
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Abylkas Saginov Karaganda Technical University, Karaganda, Kazakhstan
Ualikhanov Kokshetau University, Kokshetau, Kazakhstan
National Academy of Mining Sciences of the Republic of Kazakhstan, Astana, Kazakhstan
Abylkas Saginov Karaganda Technical University
Ualikhanov Kokshetau University
National Academy of Mining Sciences of the Republic of Kazakhstan
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