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| Study on the development characteristics of water conduction fracture zone in the whole mining process of weakly cemented overburden rock |
| Yin Wenbin, Bo Tao, Yang Jiangfeng, Jiang Wenbing |
| Shaanxi Huadian Yuheng Coal and Electricity Co., Ltd., Yulin 719000, China |
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Abstract The study on the development characteristics and height of water conduction fracture zone is of great significance for the safe production of coal and the protection of groundwater resources in the western ecologically fragile mining area. The traditional field measurement methods such as borehole TV and flushing fluid leakage observation can not monitor the development characteristics of water conduction fracture zone in the whole mining process. In view of this, considering the particularity of medium-large buried depth, thick coal seam and thick and weak cemented roof in the western Jurassic coalfield, the development law of the whole mining process of the water conduction fracture zone in No.2 coal seam of Xiaojihan Coal Mine was studied by using the underground advanced inclined hole monitoring method. At the same time, the development process and spatial form of the water conduction fracture zone were supplemented and explained by the auxiliary synchronous monitoring of the mining height, rockburst microseism and mining speed.It was found that the water conduction fracture zone was generally developed in advance during the mining of No.2 coal seam, and the advance distance was 104~150 m. The water conduction fracture zone gradually increased from the transport roadway to the inside of the working face, and the fracture development height in the middle of the working face reached the maximum value of monitoring, and it was inferred that the water conduction fracture zone was an asymmetric form with low west and high east in the tendency of the working face. When the height of the water conduction fracture zone was 50 ~ 80 m, the water conductivity was the strongest. And when the vertical height above 100 m, it was a weak water conduction fracture. The research results could provide theoretical guidance and reference for the characterization of the development characteristics of the water conduction fracture zone in similar mines.
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