Analysis of Key Factors Affecting Water Disaster in Deep Mining and Establishment of a Water Disaster Evaluation Method Suitable for Different Mining Depths

Figure 11

Definition of terms used for risk assessment of water inrush from the coal-seam floor. (a) Numerical model designed by RFPA software. (b) Water pressure distribution after self-stable equilibrium of the model before excavation. (c) Water pressure distribution after excavation. (d) Schematic diagram of water migration characteristics in floor aquifer. ①: areas with undisturbed water pressure; ②: area with disturbed water pressure; ③: cavity caused by the deformation of the aquiclude, which is situated between the aquiclude and the aquifer. The blue arrows indicate the water seepage direction.

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