Analysis on Mining Velocity Effect of Mine Pressure Behavior of Fully Mechanized Longwall Coal Mining Face with Shallow Mining Depth

In order to provide the basis for the mining support work resistance calculation and strata control of the fully mechanized longwall coal mining face,based on the geological and mining technology conditions of the fully mechanized longwall coal mining face in a mine of Shendong Mining Area,the FLAC3D and 3DEC numerical simulations were applied to study the mine pressure behavior laws at the different mining velocity(time-step 100,500 and 1 000).The study showed that there would be obvious differences in the advanced support pressure,coal wall displacement and roof broken position of the different mining velocity coal mining face.With the mining velocity increased of the coal mining face,the advanced support pressure peak distance and influence scope of the coal mining face would have a tendency to be reduced.The peak size and concentrated coefficient and the horizontal displacement value of the coal wall would have a tendency to be reduced.The broken location of the overburden strata above the coal mining face would be located at the real part of the goaf and far from the goaf.With the field monitoring,the work resistance of the miningt would be reduced with the coal mining face mining velocity increased.