## 6 Engineering Application and Case Analysis
### Case Analysis and Verification  
On 7 and 8 July 2016, there were two consecutive rockburst events in the 1300 working face and adjacent areas, of which the No. 8 event occurred in the 1301 working face. At the time of the event, the sound of dull coal cannon was heard, the shock wave was heard, coal dust was seen flying, there was low visibility, and the air volume sharply dropped (the section of the local roadway along the 1301 belt transport down chute was reduced). The location of the rockburst event is shown in Figure 18.  
The event was accurately predicted using the micro-earthquake monitoring and warning system for rockbursts in Section 5.1. The micro-earthquake monitoring results are shown in Figure 19, which shows the frequency distribution and energy distribution of micro-earthquake events. Figure 19a shows the distribution density of microseismic events. The color of the color scale corresponds to the distribution number of different microseismic events in the corresponding area; the redder color indicates the more microseismic events. Figure 19b shows the energy distribution of microseismic events; taking lg(E), E is the total energy of all microseismic events in the region, measured in Joules. The larger the size, the more intensive the energy released by the microseismic event, and the more \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Warning Level** & **Early Warning Item** & **Early Warning Energy Value** & **Disposal Measures** \\ \hline \multirow{3}{*}{Production restriction warning} & Daily energy release & 18,000 J & Keep the balanced production of a single shift, organize the production according to no more than 1.5 knives per shift and no more than 4 knives per day, and maintain the advanced low stress state. \\  & Pelease energy per unit of propulsion & 6000 J/m & Stop operation on site, stop time is not less than 2 h. \\  & Daily energy release & 20,000 J & After the stop dynamic phenomenon is stable, the production will resume, and the production will be organized according to no more than one knife per shift and no more than three knives throughout the day until the stope energy release is stable and the state of advanced low stress is maintained. \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Early warning index value of vibration energy and disposal measures. Figure 18: Location of rockburst event No.7 and No.8. serious the damage to the coal and rock mass in the region. It can be clearly seen that due to the continuous shutdown of production for many days, the bearing pressure in the surrounding rock was fully evolved. In addition to the continuous rapid progress from 5 to 8 July, on the one hand, the number of microseismic events in front of the work sharply increased; on the other hand, there were also a large number of microseismic events in the rear coal pillar area, including large energy events. However, after a recovery rate of 2.4 m/d was restored on 9 and 10 July, the microseismic events in front of the working face and coal pillar area sharply decreased, and even sporadic events occasionally occurred in the later stage. It can be inferred that the rockburst accident that occurred on 7 July and 8 August was caused by the breaking of the roof cantilever beam at the limit state, and the accident was caused by the joint action of various factors, including the continuous advance of the working face, the time production was stopped, and the speed of pushing and mining. The key measures to solve these problems are: one is to control the mining speed in the mining field. The research shows that the fundamental reason for the rockburst induced by the rapid push mining in the stope is the superposition of the advanced dynamic abutment pressure and the static abutment pressure in the stope. Under the conditions of normal speed push mining, the advance dynamic abutment pressure and static abutment pressure of the stope move forward with the roof movement, and their movement speed is essentially the same.