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古交矿区下组煤在某些区域处于突水相对危险区,尤其是在构造发育区域,突水可能更大。通过压汞试验从微观上分析了奥陶系灰岩的孔隙结构及垂向分布特征,并结合抽水试验中钻孔揭露的出水位置,确定了隔水关键层的存在以及厚度。研究表明:峰峰组上段和下段灰岩以极细小和超毛管微孔隙为主,可以作为隔水关键层,隔水关键层使大面积受水压威胁下组煤得以解放。
The coal in the lower group of Gujiao Mining Area is located in the relative dangerous area of water inrush in some areas, especially in the tectonic development area, and the water inrush may be larger. The pore structure and vertical distribution characteristics of Ordovician limestone were analyzed microscopically by mercury intrusion test. The existence and thickness of critical water-barrier layers were determined by combining with the water discharge position revealed by drilling in pumping tests. The results show that the limestone in the upper and lower parts of the Fengfeng Formation is dominated by extremely fine and ultra-microporous micropores, which can be used as the key barrier for water separation. The critical water-blocking layer can liberate the large-area coal-based coal under the threat of water pressure.