Study On Water Yield Capacity And Water Inrush Risk Of Roof Sandstone Aquifer Based On Multi-attribute Fusion

Yuncheng Minefield is located in Yuncheng County,Shandong Province,which belongs to Shandong Longyun Coal Industry Co.,Ltd.At present,the main mining area is Permian Shanxi Formation coal seam 3.Its water-filled aquifer is mainly roof Shanxi Formation and Shihezi Formation sandstone aquifer.Based on the geological data,hydrogeological data,drilling data,geophysical data and water inrush data of the first mining area in Yuncheng Minefield,and on the basis of studying the structural characteristics of coal seam roof rock strata,the water-bearing and water-resisting strata of coal seam roof are divided in detail.Based on the theory of multi-attribute fusion,the water yield capacity of roof sandstone aquifer and the risk of roof water inrush are studied.With the help of FLAC3D numerical simulation software,the development law of water-conducting fracture zone after 3 Coal Seams Mining is studied,the relationship between water-conducting fracture zone and mining thickness and working face length is obtained,and the corresponding safety zoning map of roof caving is drawn.Based on the analysis of the main controlling factors of water yield capacity roof of coal seam,the four fusion factors of water yield capacity evaluation of roof rock are determined,which are sandstone thickness,sand-mud ratio,drilling grout consumption and fault fractal dimension.The correlation between the main controlling factors and water yield capacity roof sandstone aquifer is studied by grey correlation analysis(GRA)and principal component analysis(PCA).According to the results of correlation analysis,the concept and evaluation system of water yield capacity index of roof sandstone aquifer are put forward.The objective decision of evaluation index weight is realized by using fuzzy Delphi analytic hierarchy process(FDAHP),and the calculation model of water yield capacity index of aquifer is established.In order to improve the accuracy of roof water yield capacity prediction,three comprehensive factors,i.e.water-rich index,roof geophysical resistivity and water yield capacity expert experience scoring method,are selected.The weights obtained by dimensionless treatment based on range transformation method are used.The factors are fused by analytic hierarchy process(AHP),and the water yield capacity zoning map of roof is obtained.The comprehensive zoning maps of water yield capacity roof sandstone aquifer and the zoning maps of fracturing safety are superimposed by information fusion,and the risk of roof water inrush in the study area is divided into safe zone,safer zone,more dangerous zone and dangerous zone.