Research On Movement And Deformation Regulation Of Lingzhida Mine On The Condition Of Repeated-mining

The No. 15 coal seam is repeated-mined under No.3 coal seam in Lingzhida Coal Mine, and No.3 coal seam is 100 m away from No.15 coal seam and has been mined up.The range and degree of surface movement, as well as structure over the mining area is special under this condition. It is full of significance to study the regulation of surface movement.This paper analyses the surface movement and deformation data when mining working face 15211 of No.15 coal seam. Compared with No.3 coal seam, it is concluded the range, intension, and mining effect time of No. 15 coal seam surface movement under the condition of repeated-mining. The reason is analyzed in two inspects, the roof damage height and key stratum theory. By analyzing the measuring data and using probability integral method, surface movement predicted parameters of No. 15 coal seam in Lingzhida Coal Mine is optimized. The effect of different vertical interval, horizontal distance, mining height in other working faces on surface deformation are simulated by Flac3 D 、 Tecplot 、 Surfer. The conclusion provides reference for optimizing mining method and reducing surface deformation in Lingzhida Coal Mine.