Abstract

As the depth of coal mining in China continues to increase, the number of mines with rock burst is increasing. However, under certain conditions, the problem of determining the depth of mining of critical impacts has not been solved theoretically, which has made it difficult for coal mines to grasp the depth and start to prevent rock burst. According to the different boundary conditions of mine ground pressure mining, the concept and calculation method of three critical depths in coal mining are proposed. Based on the strength criterion of medium-hard and above-mentioned coal-rock mass impact, the failure strength and stress state of coal-rock mass under dynamic load are analyzed, and the value of dynamic stress coefficient of coal-rock body is determined. According to the application of dozens of mines in the country, the impact pressure is generated under different types of working face conditions, and the coincidence rate reaches 100%. The rationality of the calculation formula of critical impact depth and the value of dynamic stress coefficient are verified. The result can provide a basis for impact ground pressure evaluation.

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