## 7 Conclusions  
1. The development height of the water-conducting fracture zone in the LC1 borehole was predicted first. As has been predicted, the development height would be 173.95 m, 12.4-16.7 times of the mining height. Meanwhile, the top boundary height of the water-conducting fracture zone is predicted to be located near KS4 in the upper section of the Anting Formation.
2. The deformation position monitored inside the LC1 borehole was compared with the changing curve of the water level in the No. 6 drainage hole. Based on the corresponding variation characteristics of deformation and water level data, it can be inferred that the top boundary height of the water-conducting fracture zone is located near KS4 at a distance of 186.1\(\sim\)207.9 m above the roof of the coal seam.
3. As is shown by the breakage characteristics of DOFS inside the LC1 borehole, a relatively large tensile strain appears at the borehole depths of 351.3 m and 390.4 m. Accordingly, it can be inferred that the separation layer appears near the middle section of Lo-ho Formation.
4. According to the displacement data obtained through the MPBXs inside the LC1 borehole, the largest displacement difference appears between the 5#MPBX at a depth of 388 m and the 6#MPBX at a depth of 324 m inside the LC1 borehole. This indicates that the subsidence deformation between the two corresponding overlying strata in the borehole is not synchronized. In other words, the largest development of the separation layer is located within the middle section of the Lo-ho Formation (between the depths of 388 m and 324 m).
5. Combined with the strain data of DOFS, displacement data obtained from MPBXs, and water level data, the height of the water-conducting fracture zone was mutually verified with the development of a separation layer in the overlying strata. The results obtained are in line with in situ monitoring data, which provides reliable guidance for the on-site control of hazards caused by separation seepers.  
Figure 12: The measured height of water-conducting fracture zone and the locations of the major separation.  
**Author Contributions:** Conceptualization and formal analysis, J.X.; writing--original draft preparation, J.X.; writing--review and editing, X.W.; validation, J.X. and X.W.; project administration, W.Q. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This research was funded by National Natural Science Foundation of China (52274097). The in situ monitoring program was under the auspices of a Research Program funded by Shaanxi Yonglong Energy Development and Construction Co. Ltd.  
**Institutional Review Board Statement:** Not applicable.  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** The data presented in this study are available on request from the corresponding author.  
**Acknowledgments:** We extend our sincere thanks to [PERSON] and other relevant mine engineers for their substantial support and help in field measurement.  
**Conflicts of Interest:** The authors declare that this study received funding from Shaanxi Yonglong Energy Development and Construction Co. Ltd. The funder was not involved in the study design, collection, analysis, interpretation of data, the writing of this article or the decision to submit it for publication.