## 5 Other Monitoring Analysis and Measurement Verification  
### Analysis and Comparison of Other Monitoring Means  
In order to further verify the accuracy of the above theoretical model and microseismic monitoring results, a comparative analysis was carried out with the results of other on-site monitoring methods, including online stress monitoring, bolt force monitoring, CT detection, etc. At the same time, the stress state of the coal body was measured and tested by the amount of drilling cuttings. Analysis of the results of online stress monitoring methods  
According to the analysis of the field observation results, the initial weighting of the 1300 working face on 15 September, the sliding head advance distance (from the original cutting hole) was 36 m, the sliding tail was 41.6 m, and the pressure step was 38.8 m (from the original cutting hole). Through the analysis of the observation results of five consecutive periodic weightings, it is inferred that the pressure step of the 1300 working face is as shown in Table 1.  
In order to monitor the stress change in the coal body of the 1300 working face in real time, the KJ550 online stress monitoring system was used to monitor the working face in real time. As shown in Figure 13, the borehole stress meters of the system were placed in the coal seam to be mined in the upper and lower level driveways, with a measurement station spacing of 25 m. As the working face advances, real-time monitoring and early warning of impact pressure were conducted in the advance influence zone of the working face. Measurement point arrangement: a No. 1 measurement station was set up 30 m away from the working face cutting end, and one measurement station was arranged every 25 m outward (with an allowable error of \(\pm\)3 m). Each measurement station had two measurement points, with borehole stress meters installed at depths of 7 m and 13 m, respectively, and spaced 2 m apart. As the working face advanced, the system was promptly dismantled and moved forward, ensuring a monitoring range of no less than 200 m. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Periodic Weighting** & **First** & **Second** & **Third** & **Fourth** & **Fifth** \\ \hline Periodic pressure step (m) & 21.6 & 23.6 & 17.6 & 19.9 & 14.1 \\ \hline Average value (m) & & & 19.4 & & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: 1300 working face periodic weighting statistics. Figure 12: Goaf affected area. The stress sensor monitoring data showed that the stress began to rise at a distance of about 60 m from the cutting end, reached its peak at about 20 m from the cutting end, and then declined. This preliminary analysis indicated that the impact zone of the 1300 working face was 60 m, and the stress peak appeared at a distance of about 20 m from the working face. However, in complex geological areas, the influence range was larger due to mining-induced stress, reaching approximately 90 m.  
(2) Analysis of observation results of rockbolt dynamometer  
In addition, according to the observation of the rockbolt dynamometer, during most of the observation period, the rockbolt dynamometer hovered around the initial rockbolt force, and the working resistance of the rockbolt near the coal wall of the working face rapidly rose, with typical rising inflection points. At a certain distance from the coal wall of the working face, the working resistance of the rockbolt rod slightly fluctuated. The classification and statistical results of the rockbolt rod working resistance are shown in Table 2 below.