Abstract:
As the mining depth of steeply inclined and extremely thick coal seams continues to increase, the rock burst disasters associated with them are becoming increasingly severe. The inducing factors exhibit diversity and evolutionary characteristics, posing difficulties for precise prevention of rock bursts. To address these issues, this paper comprehensively employs case analysis, field monitoring, and theoretical analysis to study the evolutionary patterns of inducing factors in a typical steeply inclined and extremely thick coal seams mine in Xinjiang. By analyzing five typical rock burst events in the mine, it is found that steeply inclined roofs, intermediate rock pillars, remaining coal pillars, mining depth, mining intensity, and horizontal tectonic stress are the main inducing factors. Based on triangular fuzzy numbers, the analytic hierarchy process is improved, and a quantitative calculation method for the weights of inducing factors is established, revealing the evolutionary law of these factors. The study finds that the inducing weights of steeply inclined roofs and intermediate rock pillars are the highest, indicating that they are the most significant inducing factors, and they continue to increase with the continuous mining of coal seams. The inducing weights of mining depth and horizontal tectonic stress generally increase with the continuous mining of steeply inclined and extremely thick coal seams, gradually enhancing their inducing effects. The inducing weight of remaining coal pillars generally shows a decreasing trend, indicating that the impact of remaining coal pillars in the gob on rock bursts is gradually decreasing. The inducing weight of mining intensity generally decreases. The evolutionary patterns of inducing factors in steeply inclined and extremely thick coal seams are well verified through mining data analysis, microseismic monitoring, ground stress testing, numerical simulation, and theoretical research. The research results can provide support for precise control of rock bursts in steeply inclined and extremely thick coal seams.