Abstract
With the development of faults in many coalfields, many large faults will form a relatively independent area, forming regional tectonic stress concentration. Under the influence of mining, it is easy to induce fault activation, produce mine tremor, and then induce rock burst. Through field investigation, theoretical analysis, numerical simulation, and engineering verification, the overburden movement model of No. 3504 working face square and fault activation in Liangbaosi Coal Mine was established. The stress variation and energy release law of working face advance and fault area were analyzed, and the mechanism of rock burst under the coupling action of working face square and regional tectonic stress was revealed. The results show that the regional stress adjustment and fault activation are caused by the large-scale overall movement of overburden during the working face square, and there is a peak value of elastic energy release during the fault activation, which is easy to produce large energy mine earthquake. The energy level of the daily maximum energy event is higher than that of the initial mining stage in the square period, and the location of on-site large energy microseismic event is basically consistent with the predicted fault strike. The study provides a theoretical basis for the prevention and control of rock burst during the working face square under the condition of regional tectonic stress.
Highlights
Sitao Zhu,1 Decheng Ge,1 Fuxing Jiang,1 Cunwen Wang,2 Dong Li,3 Xiaoguang Shang,1 Baoliang Zhang,4 and Zhaoyi Wang5
E energy level of the daily maximum energy event is higher than that of the initial mining stage in the square period, and the location of on-site large energy microseismic event is basically consistent with the predicted fault strike. e study provides a theoretical basis for the prevention and control of rock burst during the working face square under the condition of regional tectonic stress
Introduction e change of stress state in the fault area is the cause of rock burst and other dynamic disasters in many mines [1, 2]
Summary
According to the comprehensive columnar analysis of the coal seam in the working face, there are 2.5 m. Siltstone, 5.5 m fine sandstone, 8.9 m siltstone, and 1.6 m medium sandstone above the coal seam in the working face, with a total of 18.5 m hard rock stratum. KJ550 stress online monitoring system is installed in the working face to monitor the coal stress in real time. 12 groups (48 measuring points) are arranged according to the spacing of 25 m within 300 m ahead of the two crossheadings of the working face. E two crossheadings of the working face are managed according to the strong rock burst hazard area, and the two crossheadings of the working face are monitored by drilling cuttings every day according to the spacing of 30 m, 60 m, and 90 m
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