Study On The Forecast Of Water Inrush From10Coal Floor In102Area At Suntuan Mine

Huaibei coal mine area is located in the south of North China Coal-accumulation Zone, which has complicated hydrogeological conditions. It is in serious danger of the limestone water hazard when extracts the lower groups of Shanxi Formation of Permian coal seams the No.10coal seam, it also had occurred some water invasion. In order to ensure mining safety of lower coal mine102Suntuan group Shanxi coal mining area (10coal), the need for10coal-rich water-based floor limestone aquifer characteristics and performance studies impermeable bottom, The possibility of the occurrence of bottom water inrush forecast.In order to ensure mining safety of lower coal mine102Suntuan group Shanxi coal mining area (10coal), the need for10coal-rich water-based floor limestone aquifer characteristics and performance studies impermeable bottom, bottom to predict the occurrence of water inrush.Firstly, analysed the limestone aquifers hydrogeological conditions base on result of thickness, the lithologic features, hydration-hydraulics and development of karst of the No.1-4limestone aquifers.and discovered that the limestone aquifers which influenced the No.10coal seam are in the relatively closed units of hydrogeology, the hydrogeological conitions are moderately complex to complex, development of karst is uneven, the Hydraulic connection is bad, the watery of aquifers is weak to moderate and largely differences. Secondly, by using the elastic-plastic theory and FLAC numerical simulation software to predict the rock stress distribution in in vertical direction and damage depth of the coal seams floor. The result show that the number of the maximum depth of damage is15.03m is closed to the actually numerical of depth of damage at102area. and using the fractal theory to analysis the water-resisting property comprehensively base on the effective thickness from the No.10coal seam floor to the NO.1limestone. rock combinations. structural characteristics of rock, the Conductivity and watery of fault and the results of physical mechanics test. Finally, by using the method of water inrush coefficient and gray-fuzzy to comprehensive predict and evaluate the risk of water inrush.and the parameter sensitivity analysis of the prediction results. which provide the solution measures of preventing in the process of coal seam mining.