古交矿区奥陶系微观溶蚀孔隙特征分析

Characteristics Analysis of Ordovician Microcosmic Dissolved Pores in Gujiao Mining Area

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 under - group coal seams of Gujiao mining area is in a relatively dangerous area of water inrush in someplace. The possi- bility of water inrush is greater in tectonic development area. This paper analyzes the pore structures and vertical characteristics of Or- dovician limestone through mercury injection experiment, and combining the water location exposed by drilling in pumping test, the ex- istence and thickness of the key - aquifuge are determined. The research shows that upper and lower segment limestone of Fengfeng group are mainly very small and super capillary pores which can be taken as key - aquifuge. The large acreage of under - group coal seams suffered by water pressure threat are liberated by key - aquifuge.