The occurrence mechanism of rock burst in areas with fractured structures in coal mining is complex. To address the issue of rock burst induced by fractured structures during the mining of steeply inclined coal seams, methods such as numerical simulation, microseismic monitoring, and theoretical analysis were employed. The study examined the multi-field evolution of steeply inclined coal seams passing through fractured structures and the spatiotemporal evolution of microseismic events, revealing the mechanism that induces rock burst. The results indicate that: (1) In fractured structural areas, stress anomalies exhibit abrupt changes, with the degree of stress anomaly in Class I fracture zones being much higher than that in Class V fracture zones. When passing through the fracture zone, the coal and rock stress anomalies are concentrated, with the highest horizontal displacement and strain rate, followed by the area before the fracture zone and the area after the fracture zone being smaller. (2) The microseismic response characteristics during the passage through the fractured structure display three stages: high-frequency - low-energy, high-frequency - high-energy, and high-frequency-low-energy. The range and intensity of coal and rock activity are the largest and most intense when passing through the fracture zone, followed by the area before the fracture zone, and the smallest and most subdued after passing through the fracture zone. (3) Based on the theory of stick-slip and the strength theory of structural planes, it is calculated that the fracture zone in this mine undergoes slip displacement. The mechanism inducing rock burst is the weakening of rock integrity due to bond and jump-type rapid sliding, which is a zone of stress accumulation and release. (4) Based on the rates of stress and energy accumulation and release, the disaster process is summarized into three stages: slow increase, rapid increase, and recovery. The disaster path involves migration from the rock pillar towards the coal seam side, then to the coal-rock interface, and finally migrating back to the rock pillar near the coal seam side. These findings provide a scientific basis for the prevention and control of rock burst in similar geological conditions.
He Yijun
. Mechanism of Rock Burst Occurrence in the Fault Structure Area of Steeply Inclined Coal Seam Mining[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(S2)
: 1034
-1043
.
DOI: 10.20174/j.JUSE.2025.S2.60
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