Study on Micropore Structure and Fractal Characteristics of Jurassic Strata in Longde Coal Mine of Yushen Mining Area
The micropore structure of rock layers determines their own permeability and affects the size of mine water inflow.It is of great significance to study the micropore structure of rock layers in advance for the prevention and control of mine water hazards.Taking the Jurassic strata of Longde coal mine as the research object,the micropore structure of the strata was studied through on-site sampling,X-ray diffraction,CT scanning,mercury intrusion testing,and other methods.Based on fractal theory,systematic clustering analysis and other methods,pore structure types were classified.The results show that the mineral composition of the Jurassic rock layers in Longde Coal Mine mainly includes quartz,feldspar,and carbonate,with a content of 44.1％～90.9％,forming the main framework,and a content of 6.1％～34.3％ in cement.The average particle size of the rock layer ranges from 101.80～203.82 μm.The connectivity porosity is 3.41％～20.60％,with higher porosity at the top and bottom,and lower porosity in the middle.The complexity of the pore structure is average.According to the system clustering method,the micropore structure of Jurassic rock layers is divided into three categories.From Class Ⅰ to Class Ⅲ,the pore throat radius,porosity,permeability,and sorting coefficient decrease sequentially.The displacement pressure,relative sorting coefficient,and median pressure increase sequentially.The ability to store groundwater and the water richness decreases in sequence.The research results provide a theoretical basis for delineating the construction target area of mine drainage engineering from a micro perspective,and have positive guiding significance for the prevention and control of mine water hazards.
prevention and control of mine water hazardsmicropore structurefractal theoryYushen mining area
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