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| Analysis of floor failure microseismic law in fully mechanized caving island working face |
| Chen Long1, Wang Guoju2, 3 |
| 1. Dongpang Mine，Jizhong Energy Group Co., Ltd., Xingtai 054000，China; 2. Hebei Coal Research Institute CO., LTD.，Xingtai 054000， China; 3. Hebei Mine Microseism Key Laboratory, Xingtai 054000， China |
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Abstract In view of the threat of floor Ordovician limestone water and concealed structure in No.9222 island face of Dongpang Mine, the KJ1073 coal mine microseismic monitoring system was used to monitor floor of the working face in real time and dynamically. According to the results of microseismic monitoring, the development depth, distribution imbalance and relative position relationship with working face of microseismic events were analyzed. The results showed that during the mining process, the maximum failure depth of the working face floor was 20 ~ 25 m ; the failure range of surrounding rock on both sides of the working face was 42 m and 55 m respectively, and the mining of the back working face was helpful to the safe production of the island working face. When the advancing distance of working face reached 60 m, the failure depth of floor increased. The research results provided a basis for the determination of grouting layer and expansion distance of working face floor.
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