Abstract:
A study on multi-parameter monitoring and early warning technology was carried out for the 1311 working face in the No. 3 coal seam of Zhaozhuang Coal Mine. Integrated monitoring and early warning was realized based on microseismic monitoring, stress monitoring, and support resistance monitoring data. The research results are as follows: The microseismic events at the 1311 working face are predominantly small events with energy levels below 35,000 J, and they are mainly concentrated in the areas of the first, second, third, and fourth “square” stages of the single working face. As the working face advances toward the monitoring point, the stress at the measuring point continuously increases, and the closer to the working face, the greater the stress increment. The periodic weighting interval of the 1311 working face ranges from 5.6 m to 15.2 m, with an average of 10.9 m, indicating that the weighting behavior is relatively stable, the roof caving in the goaf is relatively timely, and no large-scale suspended roof has formed.