皖北矿区钱营孜煤矿断裂分形特征及其与煤层赋存关系的研究OACHSSCD

In order to quantitatively assess the complexity of the fault structures in the Qianyingzi mine,reveal their relationship with coal seam occurrences,and address the difficulty of effectively characterizing the nonlinear features of fault systems through traditional qualitative methods,this study applies fractal geometry theory.Using the box-counting dimension method,the fracture system of the Qianyingzi coal mine was analyzed to calculate global,directional,and segmental fractal dimensions,and the coupling relationship between the fractal dimension and occurrence conditions such as coal seam thickness and gas content was investigated,along with the fractal characteristics of roof rock fracture surfaces.The study shows that:the fracture system in Qianyingzi coal mine exhibits obvious fractal characteristics at scales of 0.25～4 km,with an overall fractal dimension of 1.654 8,and distinct spatial zoning,where high-dimension areas are mainly associated with major faults and structural nodes;there is a significant positive correlation between fracture fractal dimension and coal thickness variability,with high-dimension areas corresponding to regions of abrupt coal thickness changes;fracture fractal dimension is negatively correlated with gas content,and based on zonal fractal dimensions,the mine was divided into three structural levels:simple,moderate,and complex;the fractal dimension of roof rock fracture surfaces increases with depth.Fracture fractal dimension effectively reflects the relationship between fault distribution and coal seam occurrence,and this study can also provide a reference for the quantitative structural evaluation of similar mines under comparable geological conditions.