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| Study on different mining width and microseismic monitoring temporal and spatial distribution law in working face |
| Gao Jietao 1,2,3 |
| 1. Hebei Coal Research Institute Co., Ltd.，Xingtai 054000， China； 2. Key Laboratory of Mine Water Disaster Detection and Prevention and Control, Xingtai 054000， China； 3. Hebei Key Laboratory of Mine Microseismicity, Xingtai 054000， China |
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Abstract KJ1073 microseismic monitoring system was used to monitor the roof and floor surrounding rock activity and floor failure development under different mining width changes in No.220102 Face of Xinji No.2 Mine. And the distribution range, development and spatial distribution characteristics of microseismic events were analyzed. The results showed that the microseismic events were mainly distributed in the range of mining activities, and the influence range was 90-180 m from the machine roadway. The floor event failure depth was 18.11-36.64 m, and the deepest was 36.64 m, which was located in the wide surface. The mining width ratio was 1.59, the daily average frequency ratio of microseismic events was 1.40, and the maximum disturbance depth ratio of the floor was 1.38, which indicated that the floor failure depth was affected by the mining width and was positively correlated. The research results could provide some reference for the optimization of working face mining width and the study of floor failure law.
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