Characteristics of water disaster,evaluation methods and exploration direction for controlling groundwater in deep mining

The water source of deep mine water inrush mainly comes from two kinds of water-bearing medium:fissure water medium and karst water medium. Based on the mechanical effect of the deep mine stress on the fractured rock mass,it reveals that the fractured water medium in the deep mine exhibits the characteristics of “ high confined and weak water yield property”. Based on the evolutionary theory of paleo-karst genesis,the karst filling structure of the “ archaic crust” on the top of the Ordovician limestone in the North China coalfield is analyzed. The water-proof filling belt,the weak water-proof filling belt ( weak water permeable belt) and the water-rich belt ( water permeable belt) were divided. With three types of karst filling structures,key indicators and thresholds for type determination were ob-tained. The water inrush from the mining floor of deep coal seam is condensed into “complete floor water inrush mode”and “concentration fracture zone floor water inrush mode”. The water inrush coefficient method ( Ts method) under deep high water pressure is relatively limited. This paper proposed a “corrected water inrush coefficient method” (Ts-M-q method,suitable for complete floor water inrush mode) and a “infiltrating-seepage conversion” water inrush eval-uation method ( applicable to concentrated fractured zone floor water inrush mode). Based on the characteristics of groundwater in the deep mine and the water inrush mode,the key technology for the integrated exploration of deep mine water damage was described for the purpose of groundwater management.