Watery Features Research And Safely Evaluation Of Limestone Aquifers In104Area At Suntuan Mine

As a typical coal field of northern china, huaibei coal field has complicated hydrogeological conditions. Moreover, with the development of depth, speed and scale of coal mining, Safety production is universally in danger of Taiyuan group&ordovvician limestone aquifers. Also had occurred some water invasion. So, this paper made a variety of studies on the hydrogeology characteristicsused of the limestone aquifers and evaluation of the water inrush risk in the No.104at Suntuan Mine.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. Moreover, Using method of "large diameter well" and analogy to predict water yield, the maximum water inflow is260m3/h before dewatering, and after dewatering is221m3/h.Secondly, using the fractal theory to research the integrity of rock under the coal seam, and establishing the fem-numerical model to predict the characteristics of stress and the depth of damage under the action of mining. The result show that the number of the maximum depth of damage is12.95m is closed to the actually numerical of depth of damage at102area, and comprehensive analysised the water-resisting property base on the compressive strength, the thickness of aquifers and rock combinations. The watery of faults show that F5has mudstone,apparently squeeze, badly hydraulic conductivity and no phenomenon of effluence when tunneling in north rail alleys. Finally, 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.