Study on the Protective Effect of Upper and Lower Coal Seams in the Protection Layer Mining of Middle Distance Coal Seam Group
Abstract
Gas treatment of high gas outburst coal seam group with protection layer mining, based on the engineering geological conditions of the mine, combined with the field engineering test, study on the effect of B10 coal seam mining on the upper cover B11b and down to B8 under the protective layer in the protection layer 22108. The results showed that the protective layer mining combined with drilling pre pumping protected layer gas, the coal and gas outburst danger of the middle and lower coal seams were reduced, the coal seam gas occurrence law was changed, the permeability of coal seam was increased, and the effect of extraction was improved, which provided the technical basis and support for the regional gas control in the protective layer of the mine.
Keywords
Middle distance coal seam group, Upper and lower protective layer, Coal and gas outburst, Protective effect
Publication Date
DOI
10.12783/dtcse/cmsam2016/3586
10.12783/dtcse/cmsam2016/3586
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