Mechanism of coal-rock dynamic disasters in complex geological structure areas and its prevention

Abstract

In order to prevent the coal-rock dynamic disasters in complex geological structure areas, the temporal-spatial distribution characteristics of micro-seismic activities in the mining process of the working face in the complex geological structure area were analyzed by taking the Hujiahe Coal Mine in Shaanxi Province as the engineering background. Besides, the main control factors and occurrence mechanism of coal-rock dynamic disasters under this condition were studied, accompanying with the targeted prevention and control measures. The results show that the high-energy microseisms mainly occurred near the axis of A3 syncline. Before the occurrence of high-energy microseisms, the frequency of microseisms continued to rise, while the energy showed a “calm” or downward trend, which can be used as the precursor information to predict the coal-rock dynamic disasters in complex geological structural areas. In addition, the structural stress is contributed to the most leading controlling factors for micro-seismic activity and dynamic behaviors in complex geological structure areas, which also includes the mining disturbance, bearing coal pillar and overburden structure in goaf. The coal-rock dynamic disasters under this condition can be effectively prevented and controlled by excavating in a low and steady speed combined with the advanced pressure-relief measures.

Keywords

• dynamic disaster
• complex geological structure area
• extremely thick coal seam
• micro seism
• prevention measure