Dust conditions of stope sections in zones of "force action" on K12 coal seams

Abstract

In order to increase the daily loading per stope, accelerate preliminary workings, and create safe conditions for conducting mining operations on the floor of the Saranskaya mine of the Karagandaugol` Production Association, wells were drilled from the surface for hydraulic fracturing ({open_quotes}disjointing{close_quotes}) of the series of coal seams K{sub 7}, K{sub 10}, K{sub 11}, and K{sub 12}. The indexes of the {open_quotes}force actions{close_quotes} on the coal seams are listed, and data on the takeoff of methane from the wells drilled into the seams are presented. As the object of investigation of dust conditions in certain worked sections, the characteristics of which are shown in seam K{sub 12} was selected, which is high-gas and blowout-hazardous, and is classed in groups 4-6 with respect to dust level. The K{sub 12} seam consists of 20 bands of coal interlayered with argillites with a thickness of 0.2-2.5 cm, with inclusion of pyrite interlayers with the coal. The seam was worked by regular longwalls along the strike. The dust control measures that are being implemented in the stopes of the mine consist of wetting the coal in place and the use of a typical watering system mounted on the combines.