Study on the characteristics and development height of the Caved Zone and water-conducting fracture zone in mining No.38 coal seam at Xiaobaoding coal mine, Sichuan province

This research takes the 12383 working face of Xiaobaoding Coal Mine as the engineering background. It systematically explores the development characteristics of the caved zone and water-conducting fracture zone in the No.38 coal seam after mining through a comprehensive application of three technical methods: empirical formula prediction, borehole peeping measurement, and numerical simulation. The results show that: the maximum development heights of the caving zone and water-conducting fracture zone predicted by empirical formulas are 8.23 m and 35.30 m, respectively; the maximum heights obtained by borehole peeping measurements are 9.19 m and 37.10 m in sequence; and the maximum heights calculated by numerical simulation are 9 m and 40 m. The results obtained by the three methods are in good agreement. The research results can provide a basis for coal mines to formulate mine water prevention and control plans and safety risk management and control measures for water hazards.