Research on Development Law of"Two Zones"in Large Mining Height Fully Mechanized Mining Face
Aiming at the limitations of existing methods for predicting the development height of the two zones,FLAC3D numerical simulation software is used to simulate and calculate the development morphology and height of the water conducting fracture zone in the fully mechanized mining face with high mining height.The height and development shape of the water conducting fracture zone are calculated and predicted through empirical formulas.The development height of the water conducting fracture zone is measured on site using the downhole guide height observation instrument,and the laws of the development height and the development shape of the water conducting fracture zone are obtained,revealing the development law of the"two zones"in the large mining height working face.The research results indicate that the combination structure of"soft on top and hard on the bottom"of bedrock has a relatively strong inhibitory effect on crack development,and the height of the"two zones"is significantly lower than the calculated value of empirical formulas,which has good guiding significance for coal seam safe mining and water prevention and governance work under similar conditions.
large mining height"two zones"development heightnumerical simulationobservation by downhole guide height observation instrument
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