Abstract:
The height of the water-conducting fracture zone is a key parameter for characterizing the degree of mining-induced overburden failure in coal mining. It is of great significance for the design of wate-proof coal pillars,water-preserved mining,and gas drainage. However,with continuous advances in mining methods and technical equipment,the disturbance and failure characteristics of overburden have changed considerably. Existing empirical formulas are increasingly limited in their applicability and,in some cases,no longer provide reliable guidance for field practice. Taking the Taigemiao mining area as a case study,this study employs numerical simulation to predict the height of the water-conducting fracture zone after extraction, and compares the simulation results with those obtained from empirical formulas,ultimately deriving a region-specific empirical formula. The results indicate that in the fully mechanized top-coal caving face of the Taigemiao Area,the height of the waterconducting fracture zone is approximately 117. 5 m,and the fracture zone exhibits an arch-shaped profile with a higher center and lower sides. The height of the fracture zone in the Taigemiao and adjacent mining areas shows a strong correlation with the mining height (correlation coefficient
R = 0. 897),suggesting that mining height is the dominant controlling factor. By fitting the measured data of the fracture zone height in the region,an empirical model is obtained. This model,used together with existing empirical formulas,enables rapid estimation of the fracture zone height and provides a basis for safe coal resource extraction.