Abstract: In order to study characteristics and control measures of water-inrush from floor under the condition of high pressure in deep mining. Based on the hydro-geological conditions of Zhaogezhuang mine, and through the analysis of the waterproof properties of the water-resisting layer, the karst development situation of the floor limestone and the hydraulic conductivity of the revealed faults in the floor of the 122 seam of the 14th level, this paper holds that the water-inrush in the floor of the 122 seam of the 14th level is caused by the faults and mining effected, and the emphasis to control the water-inrush is to prevent the fault water-inrush effected by mining. Also, this paper gives the waterproof technology measures in aspects of roadway excavation and mining, and the reasonable width of the waterproof coal pillar. Through calculation, the reasonable widths of the waterproof coal pillars for the both sides of the EastⅢ are 262m and 233m.

Key words: deep mining, water-inrush from floor, faults and mining effected type, waterproof coal pillar