| This paper focuses on mine water hazard caused by full-mechanized caving mining of thick coal seam, which is under the extremely thick sandstone aquifer, in Binchang coal mine area. Its object is to ensure safe and efficient coal mining with scientific mine water prevention and control strategy. Hydrogeology, groundwater dynamics, water chemistry, rock mechanics and other theories were used, combined with regional investigation, hydrological drilling, logging, geochemical test, hydrogeological test, monitoring, overburden failure detection and numerical simulation, to study mine water hazard prevention and control technology of 401101 working face in Hujiahe coal mine.The author found for the first time that Luohe aquifer can be divided into two parts, upper part and lower part. The water yield property of the upper part is better than the lower one. Comprehensive in situ detection engineering was adopted to obtain the result that the height of fracture zone is 22.32 times as much as mining thickness and the fracture zone has reached Luohe aquifer. Detailed analysis of Luohe aquifer shows that dewatering Luohe aquifer with ground or underground boreholes is not feasible economically and technically. Countermeasures for mine water hazard prevention and control, such as dewatering properly, increasing the drainage capacity and controlling water actively, were proposed. In addition, technical system of mine water hazard prevention and control, including mining parameter and drainage system optimization control, groundwater inflow prediction, hydrological dynamic and overlying rock failure monitoring, was preliminarily established.Based on the research results, safely mining of 12 meters thick coal under extremely thick aquifer was realized to ensure high production and efficiency of Hujiahe coal mine. Great economic and social benefits were obtained. Furthermore, this thesis provides a good example for other mines in Binchang coal mine area. |
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