Meishan Iron Ore Overlying Rock Mass Collapse With Wrong Motives Management Study

With the downward movement of crebody mining depth in Meishan Iron Mine, the ground cave-in area hasbecome larger and the ground pressure more evident and the undergrou ad joints, fissures, faults and drift cave-in more serious. Due to the infulences of underground mining and underground water drainage, several cave-in areas and displacement areas have been formed in various periods and scales and due to different causes, bringing some unfavourable factors to the safe production of Meishan Mine.In view of the existing problems, the author uses the three-dimensional finite element method to analyse the mechanism of the cave-in and displacement of the overlay ng rockmass in Meishan Mine. It is aimed to calculate the greatest stress concentrated area by engineering and technical means, based on which the time, location and amount of roof caving are decided so as to ensure the mine safety with good enterprise benefit.In this research, by computer Three-dimensional finite element analysis and in combination with the real shape of the orebody of Meishan Iron Mine, the limit value of the highest stress concentration is calculated for determining the roof caving mode and step space, so as to make an effective control of the overlaying layer of mine.