## 2 Study Area  
Banji Coal Mine is situated in the northwestern region of the Huainan Coal Field, Anhui Province. The 110504 working face, primarily arranged along a longwall strike, spans 889 m in length and 262 m in width, with a mining height of 5.8 m, and holds a recoverable reserve of 1.982 million tonnes. The primary aquifer directly influencing this area is the sandstone aquifer of the 9-coal roof, while the secondary, indirect aquifers include the water-bearing layers of the \"Four Containers\" and the wind-oxidized zone at the Cenozoic Boundary. To ensure safe and uninterrupted mining at the 110504 working face, grouting is employed to block water-conducting channels. First, exploratory grouting is used to isolate the vertical fault recharge channels. Second, grouting serves to interrupt the recharge effect from the 9-coal roof sandstone aquifer, which is hydraulically connected to the Four Containers, along the lateral direction. Third, exploration is conducted near the tectonic structures in the floor close to the cutout region.  
The study area encompasses the region covered by the D1, D2, D3, D4, D5, and D6 ground hole groups. Cement-clay slurry was used as the primary grouting material, with a total grouting volume of 145,500.43 m\({}^{3}\), including 48,520.12 tonnes of cement and 12,576.69 tonnes of clay. The average dry material dosage was 1.50 tonnes per meter of unit length. The grouting process was carried out in layers, targeting the bottom boundary of the wind-oxidized zone, the upper and lower sandstones above the 9-coal roof, and the four ash layers of the Taiyuan Formation. Figure 1 outlines the study area's boundaries and the arrangement of the surface hole groups.  
We consider whether the research results are applicable to other mines from the following aspects.  
1. Geological features Compare the geological structures of different mines. Analyze and study the similarities and differences in geological structures between mines such as Banji mine and other mines. If other mines have similar geological structures, rock types, fault distributions, etc., then the research results may have some universality. For example, if research finds that a specific geological structure is favorable for a particular mine water treatment method, and other mines have similar structures, then this treatment method may also have potential applications in those mines.  
Consider hydrogeological conditions. Compare hydrogeological parameters such as groundwater flow patterns, aquifer characteristics, and water level changes in different mines. If other mines are similar to the research mine in these aspects, then the research results may be applicable to those mines. For example, if research shows that a certain groundwater treatment technology is effective under specific hydrogeological conditions, and other mines have similar hydrogeological conditions, then the technology may also be effective in those mines.
2. Mining activities  
Examine mining methods and scale. Analyze the mining methods (such as open-pit mining, underground mining); mining depth; mining intensity; and other factors of different mines. If other mines adopt similar mining methods and scales, the research results may have generalizability. For example, if a study finds that a certain mine water management strategy is feasible under a specific mining method, and other mines also use the same method, then the strategy may also be applicable in those mines.  
Figure 1: Coverage area of well groups D1, D2, D3, D4, D5, and D6.  
Consider the lifespan and mining stages of the mine. Different mines may be in different stages of mining, such as initial mining, mid-term mining, or final closure. The universality of research results among mines at different mining stages also needs to be considered. For example, if effective mine water management measures are developed for mines in specific mining stages, these measures may also have reference value for other mines in similar mining stages.