Regularities of Destruction in Seam Floor under Different Action Patterns of Water Pressure and Mining Width of Working Face

摘要

Mining of deep coal resources is more and more seriously threatened by high pressure karst water in seam floor. By using numerical test, the paper analyzed the relationship between the destruction degree of mining disturbance in aquifuge of the floor of working face and the mining width of working face under specific geological conditions, obtained the critical mining width of preventing water hazards from floor of working face and ensuring mining safety. At the same time, in term of essential regularities of karst geology and karst development, the paper seriously studied and analyzed the structural characteristics of high pressure water bearing media in the floor and action patterns of high water pressure on aquifuge of the floor of working face, and classified them into different categories. Through numerical test study, destruction characteristics and conditions inducing water outburst of different water action patterns in overlying aquifuge under disturbance of specific mining and excavating engineering were analyzed, important conclusion that the destruction degree of uneven-distributed water pressure in aquifuge is significantly lower than that of even-distributed water pressure obtained. Under the same water pressure, the destruction extent and depth of water pressure acting along the strike of coal seam are bigger than those of water pressure in other directions in the floor.