Water Abundance Law Of Ordovician And Water Inrush Forecast In Yanzhou Mine Area

Being the basement of coal measure strata in North China coal mine,the Ordovician limestone aquifer is the main water sources of exploiting the Carboniferous coal bed.For the deep mining depth,Ordovician water with high pressutr has become one of the important threat factors of deep mineng.Studying the migration and water aboundance law of deep fracture-karst aquifer and evaluating and forecasting its threat is the most important research project to enure the safety of deep coal seam mining.For the greater depth and closing to the Ordovician limestone aquifer,the Carboniferous coal bed of Yanzhou coal field is threatened by the deep high pressure confined water from Ordovician.The paper takes Xinglongzhuang,Dongtan,Baodian,Nantun,Yangcun,Beisu coal mine of Yanzhou coal field as the researched area.The water abundance law and the water inrush risk of the upper part of the middle Ordovician limestone aquifer is exposed by geological analysis,mercury injection test,mathematical geology,pumping test and the groundwater flow field simulation.And independent development a program of geophysical detection with 3d visualization disaster prediction.The main results are as fellows:(1)The spatial distribution law of the floor of the Carboniferous coal bed is exposed by drawing map of the cross section and correlation of the Carboniferous coal bed and aquifer,water-resisting layer in Yanzhou mine area.Discribed and summarized the rock types of the upper part of the middle ordovician limestone.(2)The fracture rate of the upper part of the middle Ordovician limestone is organized to study the space characteristics of the upper part of the middle Ordovician limestone.And its corrosion condition of water medium is calculated using the data of the pumping test.The developmental mechanism of Ordovician karst is also exposed with structure and flow conditions.(3)Using the mathematical geology and the result of the pumping test,the water abundance law and the water inrush risk of the upper part of the middle Ordovician limestone aquifer is exposed.(4)The ground water model of the upper part of the middle Ordovician limestone aquifer is established and used to calculate the capacity of water inrush of 16~#and 17~#coal seam.(5)Combined the VTK technology,the Qt technology,and the 3D visualization system to realization three-dimensional display,arbitrary slice extraction and the display of geology abnormal by the software that independent development.At last,its application effect is verified.