Research On Capacity Of The Roof Of The Underlying Space District In Gongchangling Open Iron Mine

Gongchangling open iron ore mining company, many years ago as a collective and individual small occurrences of non-standard dig up the land, the house is open-pit mining of the mining area where the formation of a large number of mined areas. In recent years, mining company cooperated with Northeastern University, by using geophysical methods, the basic identification of a certain distribution of cavity depth, size, and so on. When the size of mined areas, the depth control in a certain range, overlying the surface can still provide a certain capacity, machinery and equipment, vehicles can safely pass through (or part of the limit), the impact of carrying capacity of the overlying surface area than the size of the empty, depth, location of, but also to the mechanical properties of rock, boundary conditions and other factors are closely related. Therefore, we refer to the empty area where surface mining area of family interpretation map, the area was mined number KQ01～KQ40and take KQ05and KQ34for an example, study the bearing capacity of the overlying rocks to make sure that machinery and equipment, vehicles can pass through safely.Firstly, in this paper, maked a comprehensive analysis of relevant literature, described the gob roof capacity of research methods. And through field investigation and laboratory tests, an empty area of the hard rock roof level of the full extent of rock and rock mechanical parameters.Secondly, through the results of previous studies analyzed and summarized, with six of the gob roof calculated the minimum safe thickness. Combined with the specific circumstances of the cavity, using theoretical analysis method for calculating the bearing capacity of an empty area of the roof.Finally, by using FLAC3D numerical simulation model of mined areas, load analysis, analysis of the bearing capacity of roof space area. Combined with theoretical analysis and numerical simulation methods, and ultimately determine the bearing capacity of the roof cavity,district to do a security classification from KQ01to KQ40.