Abstract
The coal seam being mined by #3103 working face of Shangzhuang Coal Mine is relatively close to its adjacent seam. Moreover, the adjacent seam contains considerably high gas content. Therefore, in order to prevent excessive gas exceeding the stipulated limit as a result of massive gas emission from the adjacent seam during the initial collapse of the roof, forced caving scheme is worked out to deal with the roof of the working face based on the site conditions. On the one hand, pre-breaking blasting with deep holes adds up to the fissures in the upper adjacent seam, which not only enhances the effects of gas drainage in the adjacent seam in high position roadway, but prevents coal and gas outburst accident arising from floor collapse in large area. The practices proved that the forced caving scheme is feasible and effective to prevent outburst in the working face with upper adjacent seam.
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