Search

Using the theory of gas geology, at No. 8 Mine in Pingdingshan mine area, based on the control characteristics of geological structure on the regional area, mining area and mine gas occurrence, authors studied the control characteristics of a three-level structure on outbursts coal seam gas occurrence characteristics in Pingdingshan No. 8 Mine. Research results show that the regional structure establishes the fundamental key of high gas in Pingdingshan mine area. The mining area is divided into two gas occurrence units by geological structure, and the gas occurrence is axially symmetric distributed around Likou syncline. The structure controls the outbursts coal seam gas occurrence and the distribution of structural coal in the coalfield, which causes the banding distribution of coal seam with coal and gas outbursts hazard. Based on the study, the coal and gas outburst favorable zone is reasonably divided. [ABSTRACT FROM AUTHOR]

In order to effectively control gas unbalance phenomenon of gas occurrence in coal mine, this paper put forward the concept of gas enrichment area and gave the general characteristics of gas enrichment area. Based on geological condition in Zhaogu No. 1 Coal Mine, the paper discussed the gas geological features and analyzed the formation mechanism of gas enrichment area in the thick loess-thin bedrock coal seam, and then obtained the recognition method of gas enrichment area by the overlying bedrock characteristic of coal seam. On the basis of which, the gas enrichment area of Zhaogu No. 1 Coal Mine was confirmed, that was the bedrock layer thickness greater than 50 m and coal seam overlying bedrock gradient greater than 0. 06 or the bedrock layer thickness greater than 150 m area. Coal mining practice verified gas enrichment area identification and actual gas occurrence consistency. [ABSTRACT FROM AUTHOR]