Due to coal wall spalling is also one of the sources of flying gangue, and the displacement of coal wall can qualitatively reflect the degree of wall caving, so this paper use flying gangue in steeply dipping seam as the object of study, based on distinct element method (DEM). By using numerical simulation, the derivative mechanism for flying gangue under the different mining height in steeply dipping seam were systematically studied. The results show that the severity of wall caving has an increasing trend along with mining height increases, and the extent of injury of flying gangue caused by wall caving also has an increasing trend.
The kinematic behavior of the collision between the flying gauge and the bottom plate, existing in steep seam mining on longwall mining working face, is improved, and the flying gauge applied in steep seam mining on longwall mining working face, is studied. Based on non-probability interval analysis, which is convenient and practical in uncertain measurement, the motion model of flying gangue is established under uncertain environment. With theoretical analysis and numerical simulation, the kinematic characteristics of a flying gangue in steep seam mining on longwall mining working face, is investigated, and the kinematic mechanism of flying gangue is demonstrated. The accurate estimations of the kinematic motion and energy of a flying gangue, will improve both the flying gauge control in steep seam mining on long wall mining working face and the safe mining in steep seam.
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