Study on floor failure characteristics of working face passing anticlinal section based on micro-seismic monitoring

In order to explore the floor failure characteristics of the passing anticline section of the working face, taking the 16091 working face of Zhaogu No.1 mine as an example, the passing anticline section and the normal mining section are divided according to the actual geological conditions of the working face and the field microseismic monitoring data, and the distribution characteristics of microseismic events of the passing anticline section and the normal mining section are compared and analyzed. The failure characteristics of the floor of the working face passing anticline section under the microseismic angle are revealed. Then the failure law of coal mining floor under anticlinal structure is revealed by similar simulation test. The results show that the anticlinal axis of B₁ is a region of high energy core density when the working face passes through the anticlinal section; the failure depth of the floor in the early and late anticlinal sections of the working face is 1.12 and 1.08 times that of the normal mining section, respectively, and the failure boundary of the floor touches the interior of L₈ limestone. In the process of coal mining on deep confined water body, the tectonic stress in the passing anticlinal section has a significant effect on the instability failure of floor.