Research on the permeability resistance of a typical fault based on partitions of structural complexity

To explore the risk of water inrush associated with mining with pressure, the fractal dimension method is applied to quantify the partition of structural complexity within the deep fault zone of a newly planned mining area, including complex area, medium area and simple area. The engineering geological model of the Beigong No. 2 fault is established in the complex area, using the Nos. 5 and 7 mining area of the Dongtan Coal Mine as the geological background. Combining measurement of mining failure in this coal mine and analysis of permeability resistance of the fault zone by engineering geological analogy, the concept of a safety coefficient of mining with pressure is put forward, which can be used as a quantitative criterion for evaluating the risk of water inrush from the Ordovician limestone aquifer. The evaluation methods and results of this research have important reference value for the evaluation of water damage in other mining areas with similar geological conditions.