## 5 Zonation Prediction of the Water-Bearing Properties of the Weathered Bedrock in the Study Area
### Validation of Water-Bearing Property Partition Predictions  
(1) Verification of the water evacuation boreholes  
Among the recently mined working faces in the southern flank of the Ningtiaota Coal Mine, working faces S1232, S1233, and S1234 are strongly affected by the burnt rock aquifer, and working face S1231 is affected only by the weathered bedrock aquifer. Therefore, this paper combines the downhole water evacuation data of the working face S1231 to verify the accuracy of the water-bearing property zoning through the measured data of water inflow from the downhole water evacuation boreholes. On the basis of the fine zonation prediction of the water-bearing properties of weathered bedrock and the results of water-bearing properties zoning, working face S1231 is divided into three types of water-bearing properties zones: type 1 belongs to the high water-bearing properties zone; type 2 belongs to the moderate water-bearing properties zone; and type 3 belongs to the low water-bearing zone. The water-bearing property zoning and the layout map of the pumping test boreholes are shown in Figure 7.  
According to the initial water inflow of each drilling site, there are eight boreholes with an initial water inflow q of \(\geq\)40 m\({}^{3}\)/h, among which there are six boreholes located in type 1, and the borehole with the largest initial water inflow in the high water-rich zone is T18, with an initial water inflow of 75 m\({}^{3}\)/h. The average water inflow of the water evacuation boreholes in the high water-rich zone is 31.63 m\({}^{3}\)/h. Most water evacuation boreholes  
Figure 6: Water-bearing properties of the weathered bedrock zonation map. within type 2 have an initial water inflow q between 10 and 40 m\({}^{3}\)/h, and only boreholes T33 and T31 have an average water inflow of 20.47 m\({}^{3}\)/h in the moderately water-rich zone. The initial water inflow of the evacuation boreholes in type 3 is less than 20 m\({}^{3}\)/h, and the average water inflow of the evacuation boreholes in the low water-bearing properties zone is 12.43 m\({}^{3}\)/h. The initial water inflows of the three zones are consistent with the results of the predicted water-bearing properties;  
(2) Verification of the water inrush point: At the water discharge point of the S1210 working face, a water inrush incident occurred on the roof (Figure 5). This working face is the first working face on the southern flank, approximately 6000 m in length and 300 m in width. On 30 May 2011, when the working face had advanced to a depth of 61 m, a sudden water inrush accident occurred, with an initial inflow rate as high as 1300 m\({}^{3}\)/h. The water source for the inrush was primarily the confined water from the weathered bedrock fractures of the overlying Zhiluo Formation, which is consistent with the high water-bearing property of the weathered bedrock in this region;  
(3) Hydrological borehole pumping test verification in adjacent mines  
The Hongliulin Minefield is located in the south of the Ningtiaota Minefield, with its boundary adjacent to the Ningtiaota mining area, and the two minefields share similar geological conditions, making it possible to use the hydrogeological data from the Hongliulin mining area to verify the accuracy of the model. Ten hydrogeologic boreholes within the Hongliulin Minefield were randomly selected to predict their water-bearing properties, and the predicted results were compared with the actual water inflow, and the results are as follows (Table 8):  
Comparing the actual water-bearing properties of the hydrological boreholes in the Hongliulin Minefield with the prediction results, the KDE-Bayes discriminant prediction model achieved an 80% prediction accuracy for the 10 sample sets. The predicted results are in good agreement with the actual results, demonstrating that the model still holds reference value in mining areas with similar geological conditions.