Evaluation On Water Abundance Characteristics And Water Inrush Risks Of The Limestone Aquifer Of Taiyuan Formation In Yangliu Coal Mine

As a typical coal field of northern china,Yangliu coal mine has threatened commonly by Taiyuan group limestone aquifer during mining the lower coal seams of Shanxi formation(No10coal seam).Therefore we should studies on the water yield property of the limestone aquifers and the performance of water-proof of No10coal seam floor.to make sure the coal mining safety.Firstly, analysed the limestone aquifers’ hydrogeological conditions and characteristics of water yield property base on results of the No.1～4limestone aquifers’ thickness,the lithologic features,the development of karst and the hydration-hydraulics. The results showed that the No.1～4limestone aquifers has a weak water yield property and weak permrability,development of karst is uneven,the runoff condition of groundwater is poor and inadequate supplies. Secondly,using the empirical formula and the method of FLAC3D to calculated and simulated the destruction depth is13.15m,and using the fractal theory to research the integrity of rock under the coal seam,analysised the water-resisting property base on the thickness of aquifers,the physical and mechanical properties and the rock combinations.Finally,using the gray-fuzzy method to set a mathematical model to evaluate and partition the risk of water inrush.