Study on the development height of the water-conducting fault zone in the overlying rock of thin bedrock and thick loose coal seam

Abstract

Aiming at the difficulty of determining the height of the water-conducting fault zone in the coal seam with thin bedrock and thick loose layer, engineering tests were carried out on the 3301-working face of Shanxi Sanyuan Coal Mine. The theoretical prediction of the height of the water-conducting fault zone was carried out by means of numerical simulation, and the dynamic change process of the height of the water-conducting fault zone of the mining overlying rock was analyzed. The results show that the heights of the water-conducting fault zone in the 3301-working face of the Sanyuan Coal Mine are 62.9m, 64m, and 61.1m respectively by empirical formula prediction, numerical simulation analysis, and field observation. The results obtained by the three methods are very close, and the research results are reliable, which can provide scientific guidance for mine water hazard prevention and control under thin bedrock and thick loose seam mining conditions.