The Determination Of Reasonable Cover Thickness And Exploration Of Surface Deformation Law About Eastern Jinshandian Iron Mine

For the moment,with the eastern zone of Jinshandian Iron Mine mining workdeepening, large area of goaf has formed above the stope,and there is also a large areaof goaf at the level of-160m~0mabove the stope,these two big goaf are independentand interaction.At the same time,there have been many cracks and subsidence andother geological disasters at the surface of the mining area in recent years,seriouslythreatening the mining area people’s life and property safety, and production safety inmine enterprises,also affecting the economic benefits of the mine enterprises. In orderto solve this problem,this paper will carry on the research from these two aspects ofcover layer thickness and surface deformation.On the one hand,on the premise ofprotecting the stope safety and reducing theore loss and dilution rate,the paper willconfirm reasonable cover thickness by respectively using the Ellipsoid DrawingTheory,numerical simulation by PFC2D,and the Kinetic Theory of Gases,and alsopropose the corresponding improvement program,on the other hand,it will alsorespectively simulate the process of the private mining excavation,the cavingexcavation and underground ore body excavation by using FLAC3Dwhich is adiscrete element software,and will result in different surface deformation，thenthrough the comprehensive analysis of the result,preliminarily summarize the causeand rule of ground surface deformation,and put forward some constructive measuresand suggestions.