Abstract
With the continuous reduction of coal resources, mining conditions become more and more complex, showing a trend of deep and large dip. There are two main problems in the mining of high dip seam: on the one hand, the roof caving characteristics of high dip seam mining are more complex, and the solution of this problem is helpful to formulate a reasonable and effective support scheme for the roof in the production process of coal mine; on the other hand, the characteristics of surface subsidence caused by mining of high dip seam, which is related to the prediction and prediction of surface subsidence. Prevention and cure. Based on this, firstly, according to the knowledge of elasticity mechanics, the mining dynamic model of high dip coal seam is established; secondly, the geological model of high dip coal seam is established by using the simulation numerical software FLAC3D, and the excavation process is simulated; finally, the excavation of the working face with 40 m and 14 m coal pillars is simulated by FLAC3D. The results show that the mining of high dip coal seam will cause a large amount of surface subsidence, which will seriously affect the surrounding rock by stress concentration. After setting 40 m and 14 m coal pillars, the serious problems of surface subsidence and surrounding rock destruction caused by mining can be effectively reduced.
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