## 5 Conclusions  
Initial saturation is one of the main factors influencing IOGI slurry-bled water seepage. In order to investigate the relationship between the influence of initial saturation on the seepage law of slurry-bled water and the water leakage at the working face, the slurry seepage flow and the leakage water of the working face under three different initial saturation conditions of IOGI were studied. This method can adequately describe the slurry-bled water seepage of IOGI, and can use the saturation monitoring method to monitor the location of water in overburden in real time to realize the visualization study of seepage. The bled water flows mainly in the horizontal direction, and the horizontal seepage velocity is about 10 times the vertical seepage velocity. In the process of grouting injection, the slurry-bled water in the overburden seeps in both vertical and horizontal directions, and the main seepage direction is the horizontal direction. The vertical seepage velocity is lower than the horizontal seepage velocity, the latter being about 10 times the former. The seepage range with different initial saturations of the overburden is different. When the initial saturation of the overburden is higher, the water capacity of the overburden under the same grouting conditions is lower; the seepage range of the overburden is larger; the seepage boundary of the overburden is closer to the working face, and the slurry-bled water can enter the working face more easily. When the initial saturation is low, the water capacity of the overburden is higher; the seepage range of the overburden is smaller; the amount of slurry-bled water is absorbed by the pores of the overburden; the seepage boundary of the bled water is farther from the working face, and the bled water cannot penetrate the working face as easily. In the grouting design, when the overburden saturation is high, in order to avoid the seepage of slurry-bled water into the working face, the thickness of the isolation layer between the grouting layer and the working face should be increased. This experimental method assumed a water-proof layer above the injection layer (regardless of the overlying strata of the injection layer); although the overlying strata were considered to have little impact on the research, this issue may need to be studied after considering the overlying strata. Second, this study focuses on the influence of initial saturation on the bled water seepage law and the working face water leakage of IOGI. In the future, the factors influencing slurry-bled water seepage, which include slurry pressure, overburden permeability, and grouting pump volume, need to be studied. In addition, a method for predicting the seepage of IOGI slurry-bled water into the working face needs to be developed. Conceptualization, J.X. and D.X. ; methodology, C.W. ; software, C.W. ; validation, C.W., J.L. and X.C. ; formal analysis, C.W. ; investigation, C.W. ; re-sources, J.L. ; data curation, C.W. ; writing--original draft preparation, C.W. ; writing--review and editing, C.W. ; visualization, J.L. ; supervision, D.X. ; project administration, J.X. ; funding acquisition, C.W. All authors have read and agreed to the published version of the manuscript. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Coal Mine** & **Sampling Points** & \begin{tabular}{c} **Natural Moisture** \\ **Content/\%** \\ \end{tabular}  & \begin{tabular}{c} **Saturated Water** \\ **Absorptivity/\%** \\ \end{tabular}  & \begin{tabular}{c} **Saturation/\%** \\ \end{tabular}  \\ \hline Linhuan & \begin{tabular}{c} \#9 coal seam floor sandstone \\ \#9 coal seam floor mudstone \\ \end{tabular}  & \ \begin{tabular}{c} 1.64 \\ 2.09 \\ \end{tabular}  &
\begin{tabular}{c} 1.98  
**Funding:** This study was funded by the \"Research Startup Foundation Project for Advanced Talents, Shanxi College of Technology\" and the \"Science and Technology Innovation Project of Universities of Shanxi Province\" (No. 2024L443).